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A147215
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
+0
1
1, 1, 1, 1, 1, 1, 1, 17, 41, 71, 215, 773, 2523, 9517, 44347, 255961, 1482711, 8989887, 64060215, 492775957, 4232478379
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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