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A145968
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a one by five or five by one block.
0
1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 16, 27, 69, 151, 481, 1224, 4362, 12863, 54770, 198381, 1006602, 4307827, 25870297, 130523404, 917353447, 5499437681, 46147817424, 329292463469, 3264965678695, 27531225103405
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0
.0.1.1.1.1.1.0.0
CROSSREFS
Sequence in context: A319913 A073436 A094575 * A343537 A192579 A215658
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 25 2008
STATUS
approved