A147198 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 13, 13, 27, 27, 85, 85, 297, 297, 1599, 1599, 7901, 7901, 42229, 42229, 268975, 268975

Offset

1,9

Links

Table of n, a(n) for n=1..28.

Example

Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.1.1.1.0.1.1.1.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.0.0.1.0.1.0.0.0

Crossrefs

Sequence in context: A032022 A335357 A325679 * A147048 A110192 A014414

Adjacent sequences: A147195 A147196 A147197 * A147199 A147200 A147201

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved