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A145245
1/5 of the number of 5-colorings of an n X n array symmetric under 180 degree rotation.
0
1, 4, 172, 7168, 3254620, 1429959400, 6856279647904, 31816048080263248, 1611557504007762068188
OFFSET
1,2
CROSSREFS
Sequence in context: A245323 A348085 A195631 * A081783 A222921 A318216
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved