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A146678
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-1100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 4, 7, 14, 21, 42, 97, 337, 907, 3367, 9291, 36318, 129686, 674043, 2983615, 17944470, 88292506, 606666014, 3595901269, 30553144868, 219341547026
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.0.1.1.0.0.0
.0.0.1.1.1.0.0.0.0
.0.1.0.0.1.1.0.0.0
.0.1.0.0.0.0.1.0.1
.1.1.1.0.0.0.1.1.1
.1.0.1.0.0.0.0.1.0
.0.0.0.1.1.0.0.1.0
.0.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.0.0.0
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CROSSREFS
| Sequence in context: A147372 A201272 A147440 * A146417 A008370 A048241
Adjacent sequences: A146675 A146676 A146677 * A146679 A146680 A146681
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Nov 04 2008
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