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A145246
1/6 of the number of 6-colorings of an n X n array symmetric about main diagonal.
0
1, 25, 2625, 1157625, 2144197125, 16680941258625, 545049010783958625, 74801401778343775334625, 43116460181763524110077949125, 104384410248808682805556599342377625
OFFSET
1,2
CROSSREFS
Sequence in context: A324417 A167036 A342107 * A082488 A363865 A209850
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 05 2008
STATUS
approved