A147321 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 7, 16, 39, 109, 339, 1359, 6341, 32204, 186717, 1250465, 9543435, 82560858, 815884422, 9279731421, 121699162939, 1834559945393, 31585819621707

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.1
.0.0.0.0.1.1.1.1
.0.0.0.1.0.0.0.1
.0.0.0.1.0.0.0.1
.0.0.0.1.0.0.0.0
.0.1.1.1.1.1.0.0

Crossrefs

Sequence in context: A014140 A271788 A103439 * A103030 A263316 A001698

Adjacent sequences: A147318 A147319 A147320 * A147322 A147323 A147324

Keyword

nonn

Author

R. H. Hardin

Status

approved