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A172667
Number of 3*n X n 0..2 arrays with row sums 5 and column sums 15
1
0, 0, 1680, 1252634243520, 15966070888767791932191, 2333327772435239191435579651896000, 2927463235524353975393755326111103021707295200
OFFSET
1,3
LINKS
CROSSREFS
Sequence in context: A172568 A172673 A172768 * A221204 A145292 A228183
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2010
STATUS
approved