A147348 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01010-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 1, 13, 1, 69, 13, 485, 49, 4382, 229, 57887, 1867, 1002742, 20463, 24091943, 291821, 827339114, 6315721, 38784934830, 181852653

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.0.1.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.1.0.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.1.0.1.0.0.0

Crossrefs

Sequence in context: A322664 A286457 A327766 * A081224 A104793 A243883

Adjacent sequences: A147345 A147346 A147347 * A147349 A147350 A147351

Keyword

nonn

Author

R. H. Hardin

Status

approved