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A146821
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 17, 41, 79, 223, 801, 2615, 9741, 48585, 263431, 1569087, 9472069, 65995437, 509339343, 4406836165
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.1.1.1
.1.1.0.0.1.1.1.0
.1.1.0.0.1.0.0.0
.0.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.0
.0.0.0.1.0.0.1.1
.0.1.1.1.0.0.1.1
.1.1.1.0.0.0.0.1
CROSSREFS
Sequence in context: A107147 A049078 A209544 * A181981 A089637 A135471
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved