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

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