A147136 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1001-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 81, 81, 343

Offset

1,13

Links

Table of n, a(n) for n=1..21.

Crossrefs

Sequence in context: A147032 A146261 A146176 * A146844 A146193 A146727

Adjacent sequences: A147133 A147134 A147135 * A147137 A147138 A147139

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved