A146856 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 27, 587, 1133, 10901, 28287, 585741, 1701229, 131274347, 487724577, 70353958073, 323657950757, 55264471537249, 310091943069627, 90510403672783457, 614791345688856355

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

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

Crossrefs

Sequence in context: A147202 A146776 A147218 * A217409 A256361 A293927

Adjacent sequences: A146853 A146854 A146855 * A146857 A146858 A146859

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved