The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A073773 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A073773

Number of plane binary trees of size n+2 and height n.
(history; published version)

#11 by Michael De Vlieger at Sat Mar 02 10:37:25 EST 2024

STATUS

proposed

approved

#10 by Amiram Eldar at Sat Mar 02 10:31:18 EST 2024

STATUS

editing

proposed

#9 by Amiram Eldar at Sat Mar 02 10:31:07 EST 2024

LINKS

Henry Bottomley & Antti Karttunen <a href="/A073345/a073345.txt">Derivations of the formulas for the diagonals of A073345 & A073346.</a>.

STATUS

proposed

editing

#8 by Michel Marcus at Sat Mar 02 09:09:11 EST 2024

STATUS

editing

proposed

#7 by Michel Marcus at Sat Mar 02 09:09:08 EST 2024

LINKS

H. Henry Bottomley & A. Antti Karttunen <a href="/A073345/a073345.txt">Derivations of the formulas for the diagonals of A073345 & A073346.</a>

FORMULA

a(n) = A073345(n+2, n).

a(n < 3) = 0, a(n) = ((n^2 - 6)*2^(n-2)).

CROSSREFS

A073773(n) = A073345(n+2, n). Cf. A014480, A073345, A073774, A028878.

STATUS

approved

editing

#6 by N. J. A. Sloane at Thu Jun 16 23:27:21 EDT 2016

LINKS

H. Bottomley & A. Karttunen <a href="/A073345/a073345.txt">Derivations of the formulae formulas for the diagonals of A073345 & A073346.</a>

Discussion

Thu Jun 16

23:27

OEIS Server: https://oeis.org/edit/global/2523

#5 by Charles R Greathouse IV at Thu May 01 02:48:25 EDT 2014

AUTHOR

_Antti Karttunen _, Aug 11 2002

Discussion

Thu May 01

02:48

OEIS Server: https://oeis.org/edit/global/2210

#4 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

H. Bottomley & A. Karttunen <a href="/A073345/a073345.txt">Derivations of the formulae for the diagonals of A073345 & A073346.</a>

KEYWORD

nonn,new

nonn

#3 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

LINKS

H. Bottomley & A. Karttunen <a href="A073345a073345.txt">Derivations of the formulae for the diagonals of A073345 & A073346.</a>

KEYWORD

nonn,new

nonn

#2 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

LINKS

H. Bottomley & A. Karttunen <A HREFa href="http://www.research.att.com/~njas/sequences/A073345.txt">Derivations of the formulae for the diagonals of A073345 & A073346.</Aa>

KEYWORD

nonn,new

nonn