A147001 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 4, 5, 13, 19, 43, 57, 239, 521, 2347, 5442, 24758, 63173, 355006, 1139569, 7776109, 29105899, 223723640, 955226817, 8533424348

Offset

1,7

Links

Table of n, a(n) for n=1..25.

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.1.0.0.0.1.0.0.0
.1.0.0.0.1.0.0.1
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.1.0.0.1.0.0.0.1
.0.0.0.1.0.0.0.1
.0.1.1.1.1.1.0.0

Crossrefs

Sequence in context: A258281 A094029 A005672 * A247325 A140683 A304599

Adjacent sequences: A146998 A146999 A147000 * A147002 A147003 A147004

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved