A146475 - OEIS

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A146475

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 15, 35, 57, 245, 579, 3057, 8465, 49975, 173815, 1305505, 5674409, 52338659, 276967501, 3125019047, 20455456921, 286529633207, 2318729204115

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OFFSET

1,7

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.0.0.1.1.1.0.0

.1.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.0.0.1.1.1.0.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A125216 A058505 A133763 * A307217 A373333 A100556

Adjacent sequences: A146472 A146473 A146474 * A146476 A146477 A146478

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved