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A146870
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.
0
1, 1, 1, 1, 17, 29, 97, 473, 2981, 21253, 221233, 1979801, 27911349, 414463777, 10310356843, 228677282931, 8215295336657, 272807472524325
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.0.0
.1.0.0.0.1.1.1.1
.1.1.0.0.1.0.1.1
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.1.1.0.1.0.0.1.1
.1.1.1.1.0.0.0.1
.0.0.0.0.0.0.1.1
CROSSREFS
Sequence in context: A069755 A076727 A347530 * A146744 A103304 A104067
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved