The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A355990 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
newer changes | Showing entries 11-17

A355990

a(n) = n! / (6 * floor(n/3)!).
(history; published version)

#7 by Seiichi Manyama at Fri Jul 22 09:09:53 EDT 2022

CROSSREFS

Cf. A355989, A355991.

#6 by Seiichi Manyama at Fri Jul 22 08:41:54 EDT 2022

DATA

1, 4, 20, 60, 420, 3360, 10080, 100800, 1108800, 3326400, 43243200, 605404800, 1816214400, 29059430400, 494010316800, 1482030950400, 28158588057600, 563171761152000, 1689515283456000, 37169336236032000, 854894733428736000, 2564684200286208000

#5 by Seiichi Manyama at Fri Jul 22 08:40:47 EDT 2022

PROG

(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace((1-x^3)*(exp(x^3)-1)/(6*(1-x))))

#4 by Seiichi Manyama at Fri Jul 22 08:21:50 EDT 2022

PROG

(PARI) a(n) = n!/(6*(n\3)!);

CROSSREFS

(PARI) a(n) = n!/(6*(n\3)!);

KEYWORD

nonn,changed,easy

#3 by Seiichi Manyama at Fri Jul 22 08:21:32 EDT 2022

CROSSREFS

(PARI) a(n) = n!/(6*(n\3)!);

#2 by Seiichi Manyama at Fri Jul 22 08:21:10 EDT 2022

NAME

allocated for Seiichi Manyama

a(n) = n! / (6 * floor(n/3)!).

DATA

1, 4, 20, 60, 420, 3360, 10080, 100800, 1108800, 3326400, 43243200, 605404800, 1816214400, 29059430400, 494010316800, 1482030950400

OFFSET

3,2

KEYWORD

allocated

nonn

AUTHOR

Seiichi Manyama, Jul 22 2022

STATUS

approved

editing

#1 by Seiichi Manyama at Fri Jul 22 08:21:10 EDT 2022

NAME

allocated for Seiichi Manyama

KEYWORD

allocated

STATUS

approved