A146816 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1110-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 31, 717, 1507, 20113, 52053, 1344751, 4220463, 406071927, 1625689575, 292516297827, 1472388906019, 367500695278431, 2286735420596063

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A146784 A147240 A147210 * A146659 A160220 A133151

Adjacent sequences: A146813 A146814 A146815 * A146817 A146818 A146819

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved