Number of partitions of { 1, 2, ..., 3n } into sets of size 3.

A025035

Number of partitions of { 1, 2, ..., 3n } into sets of size 3.

Terms

    a(0) =1a(1) =1a(2) =10a(3) =280a(4) =15400a(5) =1401400a(6) =190590400a(7) =36212176000

External references