A146422 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111 pattern in any orientation.

1, 1, 1, 1, 9, 13, 35, 63, 2283, 5585, 180293, 562375, 23209995, 88508965, 13019468881, 63861201843, 14755196146889, 90930193025577, 44655947502046605, 347179958945954717

Offset

1,5

Links

Table of n, a(n) for n=1..20.

Example

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

Crossrefs

Sequence in context: A287766 A146739 A146723 * A147352 A147391 A241677

Adjacent sequences: A146419 A146420 A146421 * A146423 A146424 A146425

Keyword

nonn

Author

R. H. Hardin

Status

approved