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A146368 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 13, 31, 121, 491, 3363, 25731, 206631, 2160127, 27517339, 451415709, 9252755391, 223401136265, 6569403284147, 238066497574789, 10727503069730095, 599422231400326251, 40846404956905305813, 3394537590955437316889 (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

.0.0.0.0.1.0.0.0

.0.0.0.0.1.1.0.0

.0.0.0.1.1.0.1.0

.0.0.1.0.1.0.1.1

.1.1.1.1.0.1.1.0

.0.1.0.0.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A147022 A147014 A146376 * A147424 A146057 A062403

Adjacent sequences:  A146365 A146366 A146367 * A146369 A146370 A146371

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 7 22:29 EST 2019. Contains 329850 sequences. (Running on oeis4.)