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A145957
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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 125, 125, 821, 821, 6239, 6239, 71403, 71403, 1048093, 1048093, 19913069, 19913069, 517074745, 517074745, 17642361171, 17642361171
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0
.1.1.0.1.0.1.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.0.0.0.0.0.0.0
.0.1.1.0.0.0.1.1.0
.1.1.0.1.0.1.0.1.1
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0
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CROSSREFS
| Sequence in context: A146394 A147510 A146474 * A128019 A108411 A056449
Adjacent sequences: A145954 A145955 A145956 * A145958 A145959 A145960
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Oct 25 2008
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