A146468 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 21, 61, 413, 1837, 12959, 107653, 1592585, 19952617, 467249637, 9827027521, 347403836941

Offset

1,6

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.0.1.1.1.0
.0.1.0.0.1.0.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.0.0.1.0.0.1.0
.0.1.1.1.0.0.0.0
.0.0.0.1.1.0.0.0

Crossrefs

Sequence in context: A069133 A124714 A126375 * A081302 A058100 A219856

Adjacent sequences: A146465 A146466 A146467 * A146469 A146470 A146471

Keyword

nonn

Author

R. H. Hardin

Status

approved