A147006 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 7, 14, 39, 108, 339, 1512, 7447, 40037, 248431, 1729177, 13906995, 133020215, 1477709272, 18786585661, 273016606323, 4544925816863, 87252400485138, 1941478219409803, 49994513906410819, 1483543905376332107

Offset

1,7

Links

Table of n, a(n) for n=1..27.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.0
.0.0.0.0.0.0.1.0
.0.0.0.0.0.1.1.1
.0.0.0.0.0.0.1.0
.0.0.0.1.0.0.1.0
.0.1.1.1.1.1.0.0
.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A231464 A146920 A079939 * A146936 A184264 A298913

Adjacent sequences: A147003 A147004 A147005 * A147007 A147008 A147009

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved