A146233 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 133, 283, 2347, 6395, 87753, 251797, 22858141, 88041969, 27840502421, 144128912619, 33034155808473, 218240863171141, 101999530698529103, 841310414172182303, 1459539385749799398341

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A250766 A254692 A050882 * A146181 A105984 A115518

Adjacent sequences: A146230 A146231 A146232 * A146234 A146235 A146236

Keyword

nonn

Author

R. H. Hardin

Status

approved