A146226 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 29, 29, 221, 221, 2091, 2091, 47147, 47147, 1321607, 1321607, 74618535, 74618535, 6202582309, 6202582309

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.1.0.1.1.0.1.1.0.1
.1.0.1.1.0.1.1.0.1
.1.1.0.1.0.1.0.1.1
.1.1.0.1.0.1.0.1.1
.0.0.0.0.0.0.0.0.0
.1.1.0.1.0.1.0.1.1
.1.1.0.1.0.1.0.1.1
.1.0.1.1.0.1.1.0.1
.1.0.1.1.0.1.1.0.1

Crossrefs

Sequence in context: A070851 A040813 A022363 * A146423 A146129 A146040

Adjacent sequences: A146223 A146224 A146225 * A146227 A146228 A146229

Keyword

nonn

Author

R. H. Hardin

Status

approved