A147094 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.

1, 1, 1, 3, 7, 15, 31, 73, 307, 1451, 6775, 33773, 192865, 1471507, 13382667, 137085697, 1565839497, 20450552451, 319414253795, 5882181538191, 126047394686961, 3114606848932875

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.0.1.0.0
.1.1.1.1.0.1.0.0
.0.0.0.0.0.1.0.1
.0.0.1.1.1.1.0.1
.0.0.0.0.0.0.0.1
.0.0.0.0.1.1.1.1

Crossrefs

Sequence in context: A147235 A024876 A146598 * A326518 A147285 A147250

Adjacent sequences: A147091 A147092 A147093 * A147095 A147096 A147097

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved