A147278 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 5, 13, 29, 79, 475, 3011, 19375, 140949, 1504567, 19831039, 315319119, 5871550053, 136334165017, 3923421131189, 139268183686163

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.1.0
.0.0.0.0.0.1.1.0
.0.0.0.0.1.1.0.0
.0.0.0.1.0.0.0.0
.0.0.1.1.0.0.0.0
.1.1.1.0.0.0.0.0
.1.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A239367 A124698 A337761 * A268963 A147349 A147288

Adjacent sequences: A147275 A147276 A147277 * A147279 A147280 A147281

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved