A146675 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-1100 pattern in any orientation.

1, 1, 1, 1, 5, 1, 23, 13, 524, 295, 16870, 4271, 898998, 126315, 77111883, 11176639, 18132712367, 2597442391, 8818967242020, 846650197340, 7776283446966159, 491920350834891, 12490870356605608844, 626865570839049974

Offset

1,5

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A286897 A167572 A147476 * A201884 A294138 A207824

Adjacent sequences: A146672 A146673 A146674 * A146676 A146677 A146678

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved