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A146376 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 13, 31, 121, 491, 3357, 25639, 206564, 2153667, 27375428, 448457031, 9212009681, 222552225829, 6521884144620, 236096811899889, 10628490855495893, 594148587329565431, 40503058557002692998, 3359157855652125960413 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.0.0.1.0

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.0.1.0.0.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A051402 A147022 A147014 * A146368 A147424 A146057

Adjacent sequences:  A146373 A146374 A146375 * A146377 A146378 A146379

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)