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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.
0
1, 1, 1, 1, 1, 1, 9, 15, 35, 57, 245, 579, 3057, 8465, 49975, 173815, 1305505, 5674409, 52338659, 276967501, 3125019047, 20455456921, 286529633207, 2318729204115
OFFSET
1,7
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
KEYWORD
nonn
AUTHOR
STATUS
approved