A147445 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 25, 429, 829, 9009, 20193, 266141, 668397, 14825377, 42405573, 3005094483, 10429358879, 1452403109221, 6133471038695, 1040989050455951, 5208691049601333

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.1.1.0.1.1.0.0
.1.0.0.1.0.1.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.1.0.1.0.0.0

Crossrefs

Sequence in context: A355769 A183346 A166666 * A129910 A259075 A212909

Adjacent sequences: A147442 A147443 A147444 * A147446 A147447 A147448

Keyword

nonn

Author

R. H. Hardin

Status

approved