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A147097
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 13, 21, 45, 97, 227, 551, 1339, 4289, 13667, 51899, 209203, 857785, 3894865, 18769711, 98430017, 545007039
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0
.1.0.1.0.1.1.1.1
.1.0.1.0.0.0.0.1
.1.0.0.0.0.1.0.1
.1.1.1.1.0.1.0.1
.0.0.0.0.0.1.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A117766 A243162 A147351 * A147105 A258774 A057589
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved