A147150 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 5, 15, 33, 101, 729, 5159, 33035, 302287, 3979621, 62594669, 1090041091, 25034274381, 742760513733, 26752494041629

Offset

1,6

Links

Table of n, a(n) for n=1..19.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.1.1
.0.0.0.0.1.1.1.0
.0.0.0.1.0.1.0.0
.0.0.0.1.1.0.0.0
.0.0.1.1.0.0.0.0
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A055004 A332355 A147264 * A279231 A238340 A162513

Adjacent sequences: A147147 A147148 A147149 * A147151 A147152 A147153

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved