A147232 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 27, 629, 1269, 16061, 41045, 855623, 2568747, 170862305, 635460019, 86331152665, 400700298989, 79692729384535, 451816155166949, 141187687229970535

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A146683 A146651 A146808 * A141417 A264834 A069529

Adjacent sequences: A147229 A147230 A147231 * A147233 A147234 A147235

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved