A147485 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 13, 19, 54, 129, 405, 1014, 3416, 8953, 35203, 121647, 602370, 2444491, 14100721, 64488491, 418264276, 2289523483

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 8 X 8 example
.0.0.1.1.0.1.1.0
.0.0.0.1.1.1.0.1
.1.0.0.0.1.0.1.1
.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1
.1.1.0.1.0.0.0.1
.1.0.1.1.1.0.0.0
.0.1.1.0.1.1.0.0

Crossrefs

Sequence in context: A252398 A330383 A146999 * A341650 A341640 A104189

Adjacent sequences: A147482 A147483 A147484 * A147486 A147487 A147488

Keyword

nonn

Author

R. H. Hardin

Status

approved