A147242 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0010 pattern in any orientation.

1, 1, 1, 1, 3, 9, 27, 87, 355, 2031, 15277, 134979, 1439889, 18930955, 307011633, 6239442943, 159275538371, 5042353704513, 196402826178807, 9418588421118425

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.1.1.0.0.0.0
.0.1.0.1.1.0.0.1
.1.1.1.0.1.0.1.1
.1.0.1.1.0.1.1.0
.0.0.0.0.1.0.1.1
.0.0.0.1.1.1.0.0
.0.0.1.1.0.1.0.0

Crossrefs

Sequence in context: A146786 A151029 A179263 * A148924 A113994 A302860

Adjacent sequences: A147239 A147240 A147241 * A147243 A147244 A147245

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved