A146446 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 11, 17, 249, 505, 5595, 13277, 255723, 714985, 48904687, 172919585, 23239333565, 103253283519, 18873899120725, 102743668838719, 32633484992496285, 217183989203759529, 151537474245121050379

Offset

1,7

Links

Table of n, a(n) for n=1..23.

Example

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

Crossrefs

Sequence in context: A262552 A279332 A286959 * A228055 A132092 A226258

Adjacent sequences: A146443 A146444 A146445 * A146447 A146448 A146449

Keyword

nonn

Author

R. H. Hardin

Status

approved