A147196 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

1, 1, 1, 3, 5, 13, 27, 85, 297, 1599, 7901, 42229, 268975, 2452217, 25491849, 280714479, 3504622659, 56285411319, 1100845720891, 24390611734773, 611823250262071, 18446369972491401

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.0.1.1.0.0.0.1
.0.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.0
.1.0.0.0.1.1.0.0
.0.0.0.1.0.0.0.1
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.1.1.0.0.1.1.0.0

Crossrefs

Sequence in context: A005198 A160823 A077443 * A110225 A065047 A282565

Adjacent sequences: A147193 A147194 A147195 * A147197 A147198 A147199

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved