A147429 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 11, 141, 257, 1611, 3315, 36853, 86889, 1683453, 4577119, 233675247, 765781809, 58076270521, 224796831393, 21043320110887, 95183435001619, 14150257177280215, 74929440978446429, 19854826390795440105

Offset

1,7

Links

Table of n, a(n) for n=1..25.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A027727 A019328 A119786 * A147461 A146366 A146603

Adjacent sequences: A147426 A147427 A147428 * A147430 A147431 A147432

Keyword

nonn

Author

R. H. Hardin

Status

approved