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A146869
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 9, 29, 49, 117, 309, 1103, 4069, 20291, 72247, 389841, 1904157, 13920727, 88083783, 777496329, 5560593885, 59069816813
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.1.1.0.1.0.0
.1.1.1.1.0.1.1.0
.0.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.0
.0.1.1.0.1.1.1.1
.0.0.1.0.1.1.0.1
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A350963 A098949 A031296 * A129397 A136392 A272732
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved