A147484 - OEIS

A147484

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.

1, 1, 1, 1, 1, 3, 8, 23, 63, 191, 685, 3493, 20460, 144341, 1163965, 10657560, 110643922, 1393408349, 20934516013, 373325933993, 7839237276478, 192639728351279, 5496880042565859

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OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.1.1.0.0

.1.0.1.1.1.0.0.0

.1.1.0.1.0.0.0.1

.0.1.1.0.0.0.1.1

.1.1.0.0.0.1.1.0

.1.0.0.0.1.0.1.1

.0.0.0.1.1.1.0.1

.0.0.1.1.0.1.1.0

CROSSREFS

Sequence in context: A375468 A248870 A103819 * A316980 A331321 A017929

Adjacent sequences: A147481 A147482 A147483 * A147485 A147486 A147487

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved