A147349 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 01010-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 29, 101, 333, 1235, 7837, 52915, 369366, 3142015, 30618033, 342793771, 4834668744, 81286775163, 1567484103319, 35245761964841, 926342368497234, 28497387862877415

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
.0.0.0.0.0.1.0.0
.0.0.0.1.1.1.1.1
.0.0.1.0.1.0.1.0
.0.0.1.1.0.0.0.0
.0.1.1.0.0.0.0.0
.0.0.1.1.0.0.0.0
.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A147278 A268963 A388291 * A147288 A146420 A381017

Adjacent sequences: A147346 A147347 A147348 * A147350 A147351 A147352

Keyword

nonn

Author

R. H. Hardin

Status

approved