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A146680
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
+0
1
1, 1, 1, 1, 1, 1, 1, 9, 20, 33, 56, 137, 404, 1209, 4087, 15733, 60343, 254309, 1153606, 5642466, 31006709, 182836767, 1183007758, 8378875432, 64857203324
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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