A146473 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 47, 105, 423, 1139, 5013, 16157, 89505, 364489, 2547425, 12720065, 106893393, 655837481, 6848268559, 52044360871, 671335193705, 6279476454279, 99399530079385, 1146233917953945, 22401744159971375

Offset

1,7

Links

Table of n, a(n) for n=1..29.

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.1.1.1.0.1
.0.0.0.0.0.0.1.1
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.1.1.0.0.0.0.0.0
.1.0.1.1.1.0.0.0
.0.1.1.1.0.0.0.0

Crossrefs

Sequence in context: A283064 A154622 A147251 * A282961 A165446 A167466

Adjacent sequences: A146470 A146471 A146472 * A146474 A146475 A146476

Keyword

nonn

Author

R. H. Hardin

Status

approved