A147403 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 25, 37, 81, 207, 659, 1525, 5011, 16955, 78955, 307577, 1539617, 6559267, 39653567, 197073411, 1351045655

Offset

1,9

Links

Table of n, a(n) for n=1..24.

Example

Maximal 9 X 9 example
.0.0.0.0.1.1.0.0.0
.0.0.0.1.0.1.1.0.0
.0.1.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.0
.1.0.0.0.0.0.0.0.1
.0.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.1.0
.0.0.1.1.0.1.0.0.0
.0.0.0.1.1.0.0.0.0

Crossrefs

Sequence in context: A348234 A226647 A147199 * A241764 A044451 A114057

Adjacent sequences: A147400 A147401 A147402 * A147404 A147405 A147406

Keyword

nonn

Author

R. H. Hardin

Status

approved