A147226 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11011-01110 pattern in any orientation.

1, 1, 1, 1, 1, 3, 10, 29, 94, 321, 1262, 7231, 51504, 415403, 3863371, 41121252, 505066528, 7638140887, 140942068334, 3073652987530, 79190388734899, 2405781069528047

Offset

1,6

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.1.1.0.1.1.0.0
.1.0.1.1.1.0.0.0
.1.1.0.0.0.0.0.1
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.1.0.0.0.0.0.1.1
.0.0.0.1.1.1.0.1
.0.0.1.1.0.1.1.0

Crossrefs

Sequence in context: A052976 A361365 A147363 * A301879 A147062 A293155

Adjacent sequences: A147223 A147224 A147225 * A147227 A147228 A147229

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved