A146172 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-100-111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 117, 259, 1991, 4759, 52453, 136907, 6546215, 22604681, 6955049615, 33225401665, 5312086374693, 30690294218759, 6137053540967147, 42562920511505493, 35203573251917171119, 310505729227048458909

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A050245 A351574 A031174 * A146189 A063332 A063338

Adjacent sequences: A146169 A146170 A146171 * A146173 A146174 A146175

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved