A147257 - OEIS

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A147257

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0001-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 39, 137, 661, 3965, 30475, 261877, 2593597, 32463645, 507974205, 9631596681, 224195557727, 6341197277447, 216685113312141, 8987183183859385

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OFFSET

1,6

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.0.1.0.0.1.0

.0.0.0.1.1.0.1.1

.1.1.1.0.1.0.0.1

.1.0.1.1.0.1.1.1

.1.0.0.0.1.0.0.0

.0.1.1.0.1.0.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A250413 A163686 A147165 * A146645 A146717 A147467

Adjacent sequences: A147254 A147255 A147256 * A147258 A147259 A147260

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved