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A146592
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 23, 47, 75, 181, 675, 3025, 16403, 71953, 340893, 1986607, 14754733, 121306057, 1066980245, 9641071515, 101852566849, 1271193446821
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.1.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.1
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A307530 A187094 A060651 * A107169 A297956 A298772
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved