The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A211092 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A211092

1/4 the number of n X n 0..3 symmetric matrices with every element equal to two or three horizontal and vertical neighbors
(history; published version)

#5 by Charles R Greathouse IV at Fri Dec 18 18:18:08 EST 2015

NAME

1/4 the number of nXn n X n 0..3 symmetric matrices with every element equal to two or three horizontal and vertical neighbors

Discussion

Fri Dec 18

18:18

OEIS Server: https://oeis.org/edit/global/2478

#4 by Russ Cox at Sat Mar 31 12:37:35 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Mar 31 2012

Discussion

Sat Mar 31

12:37

OEIS Server: https://oeis.org/edit/global/875

#3 by Ron Hardin at Sat Mar 31 05:39:17 EDT 2012

STATUS

editing

approved

#2 by Ron Hardin at Sat Mar 31 05:39:15 EDT 2012

NAME

allocated for Ron Hardin1/4 the number of nXn 0..3 symmetric matrices with every element equal to two or three horizontal and vertical neighbors

DATA

0, 1, 1, 19, 136, 3496, 100204, 6012109, 537556135, 86449986124, 22576823498161, 10130717811503530, 7577956550025798379

OFFSET

1,4

EXAMPLE

Some solutions for n=4

..3..3..2..2....0..0..2..2....3..3..0..0....2..2..2..2....3..3..1..1

..2..2..2..2....2..2..3..3....0..0..0..0....2..2..3..3....1..1..1..1

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Mar 31 2012

STATUS

approved

editing

#1 by Ron Hardin at Sat Mar 31 05:26:44 EDT 2012

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved