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A147419
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-0110 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 8, 17, 36, 53, 124, 323, 1007, 2889, 11702, 39960, 173688, 672545, 3448944, 15619066, 95906062, 522271313, 3756284779, 24152062634
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.1.0.0.1
.0.1.1.0.1.1.1.1
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.1.1.1.1.0.1.1.0
.1.0.0.1.0.0.1.1
CROSSREFS
Sequence in context: A052996 A112523 A369734 * A106691 A140176 A238496
KEYWORD
nonn
AUTHOR
STATUS
approved