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A147424

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 31, 123, 397, 1299, 7415, 48549, 328016, 2805259, 26286523, 261135019, 3222276941, 47592701035, 811402107260, 16468821744235, 385847309545373

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OFFSET

1,7

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.1.1

.0.1.0.1.0.1.0.0

.0.1.1.1.1.1.0.0

CROSSREFS

Sequence in context: A147014 A146376 A146368 * A146057 A062403 A066688

Adjacent sequences: A147421 A147422 A147423 * A147425 A147426 A147427

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

URL: https://oeis.org/A147424

⇱ A147424 - OEIS