A146369 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 135, 491, 1711, 5531, 18851, 87961, 493635, 2869867, 17154745, 107225849, 792577759, 6869876861, 66058401395, 676488427499, 7479488157903, 92053084127249, 1298331132850519, 20359043284485661

Offset

1,8

Links

Table of n, a(n) for n=1..30.

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.0.0.1.0
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.0.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A342422 A147432 A018367 * A146377 A147501 A147335

Adjacent sequences: A146366 A146367 A146368 * A146370 A146371 A146372

Keyword

nonn

Author

R. H. Hardin

Status

approved