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A172743
Number of n X 3 0..3 arrays with row sums 3 and column sums n.
3
1, 7, 55, 415, 3391, 28681, 248137, 2186815, 19546975, 176703337, 1612210777, 14823083089, 137176167025, 1276548044695, 11936862061495, 112092031526335, 1056512066133055, 9991003788000025, 94760438267696425, 901154863603211665
OFFSET
1,2
LINKS
CROSSREFS
Column k=3 of A333901.
Sequence in context: A069404 A198689 A320091 * A015564 A070997 A370177
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 06 2010
STATUS
approved