A147379 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 7, 15, 33, 101, 381, 1709, 8457, 46629, 303839, 2310935, 20572541, 212895819, 2545278493, 35199007061

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0
.0.1.1.0.0.1.1.1
.0.0.1.0.0.0.0.1
.0.0.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.1.0.0.0

Crossrefs

Sequence in context: A351660 A199882 A147102 * A213722 A325924 A217092

Adjacent sequences: A147376 A147377 A147378 * A147380 A147381 A147382

Keyword

nonn

Author

R. H. Hardin

Status

approved