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⇱ A146600 - OEIS

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A146600
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 19, 39, 83, 233, 711, 2313, 8511, 40097, 191977, 1081845, 6288993, 41547129, 292524045, 2387601825, 20697818111
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example:
.1.0.0.0.0.1.1.1
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.0.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.0
.0.0.1.0.1.1.1.1
.0.0.1.0.0.0.0.1
.1.1.1.0.0.0.0.1
CROSSREFS
Sequence in context: A254060 A129828 A239831 * A262997 A378231 A031379
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved