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A147227
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110 pattern in any orientation.
+0
1
1, 1, 1, 1, 1, 1, 2, 3, 6, 9, 16, 23, 72, 177, 631, 1684, 5696, 15819, 69884, 263612, 1492069, 6667995, 40872228, 203062570, 1480955534, 9070964673, 81908729534
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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