A147382 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 3, 11, 25, 47, 101, 257, 681, 1819, 5437, 17747, 62109, 244571, 1025085, 4586657, 22318221

Offset

1,9

Links

Table of n, a(n) for n=1..23.

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.1.1
.1.1.1.0.0.0.0.1.0
.0.0.1.1.1.0.1.1.0
.0.0.0.0.1.0.1.0.0
.0.0.1.1.0.1.1.0.0
.0.0.1.0.1.0.0.0.0
.0.1.1.0.1.1.1.0.0
.0.1.0.0.0.0.1.1.1
.1.1.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A293413 A056106 A320035 * A212971 A258440 A184634

Adjacent sequences: A147379 A147380 A147381 * A147383 A147384 A147385

Keyword

nonn

Author

R. H. Hardin

Status

approved