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A146905
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 13, 21, 41, 107, 243, 717, 1683, 4947, 13775, 49539, 165935, 690319, 2538097, 11779735, 49469745, 268313075, 1318481817, 8182984957
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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EXAMPLE
| Maximal 10 X 10 example
.0.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.1.0.0
.0.1.1.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.1.1.0
.0.0.1.0.0.1.0.0.1.0
.0.0.0.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0.0
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CROSSREFS
| Sequence in context: A136252 A187212 A141325 * A052282 A001993 A153263
Adjacent sequences: A146902 A146903 A146904 * A146906 A146907 A146908
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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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