A147423 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 5, 1, 9, 1, 17, 1, 189, 25, 1029, 149, 6290

Offset

1,5

Links

Table of n, a(n) for n=1..15.

Example

Maximal 9 X 9 example
.0.0.1.0.1.0.1.0.0
.0.0.1.1.1.1.1.0.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.0.1.1.1.1.1.0.0
.0.0.1.0.1.0.1.0.0

Crossrefs

Sequence in context: A336053 A266072 A376018 * A147085 A348980 A046580

Adjacent sequences: A147420 A147421 A147422 * A147424 A147425 A147426

Keyword

nonn

Author

R. H. Hardin

Status

approved