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A145930
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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 tee 1,1 1,2 1,3 2,2 in any orientation.
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0
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1, 1, 1, 1, 2, 1, 4, 1, 10, 3, 38, 10, 203, 33, 1282, 134, 10692, 947, 122622, 8780, 1931387, 97821, 38646298, 1375312, 1027005070, 27712816, 36128007770, 754977953, 1725393598658, 26645291289
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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EXAMPLE
| Maximal 9 X 9 example
.0.1.1.1.0.1.1.1.0
.1.0.1.0.1.0.1.0.1
.1.1.0.1.1.1.0.1.1
.1.0.1.0.0.0.1.0.1
.0.1.1.0.0.0.1.1.0
.1.0.1.0.0.0.1.0.1
.1.1.0.1.1.1.0.1.1
.1.0.1.0.1.0.1.0.1
.0.1.1.1.0.1.1.1.0
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CROSSREFS
| Sequence in context: A146011 A104620 A186724 * A145762 A024539 A128271
Adjacent sequences: A145927 A145928 A145929 * A145931 A145932 A145933
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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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