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A146043
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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 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 21, 21, 83, 83, 385, 385, 2131, 2131, 24025, 24025, 318135, 318135, 5078109, 5078109, 98561015
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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EXAMPLE
| Maximal 11 X 11 example
.0.0.0.0.1.0.1.0.0.0.0
.0.0.0.0.1.0.1.0.0.0.0
.0.0.0.1.1.0.1.1.0.0.0
.0.0.1.0.1.0.1.0.1.0.0
.1.1.1.1.0.0.0.1.1.1.1
.0.0.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.0.0.1.1.1.1
.0.0.1.0.1.0.1.0.1.0.0
.0.0.0.1.1.0.1.1.0.0.0
.0.0.0.0.1.0.1.0.0.0.0
.0.0.0.0.1.0.1.0.0.0.0
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CROSSREFS
| Sequence in context: A127513 A091260 A171219 * A116400 A052992 A147254
Adjacent sequences: A146040 A146041 A146042 * A146044 A146045 A146046
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Oct 26 2008
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