A147264 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 5, 15, 33, 77, 553, 3895, 24243, 170053, 2059185, 30409467, 474043707, 8705603341, 222308455647, 7060172178631, 259928502701315

Offset

1,6

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.1.0
.0.0.0.0.1.1.1.0
.0.0.0.1.0.1.0.0
.0.0.0.1.1.0.0.0
.0.1.1.1.0.0.0.0
.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A212983 A055004 A332355 * A147150 A279231 A238340

Adjacent sequences: A147261 A147262 A147263 * A147265 A147266 A147267

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved