A147229 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 4, 9, 18, 29, 62, 159, 552, 1625, 6033, 18370, 76478, 293679, 1560810, 7445670, 46344151, 251751509, 1816985360, 11749000262

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.1.1.1.0.1.1.0
.1.1.0.1.1.0.1.0
.0.0.1.0.0.1.1.0
.0.1.1.0.0.1.0.0
.0.1.0.1.1.0.1.1
.0.1.1.0.1.1.1.0
.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A301257 A036695 A301025 * A008149 A008025 A301196

Adjacent sequences: A147226 A147227 A147228 * A147230 A147231 A147232

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved