Lah numbers: a(n) = n!*binomial(n-1,5)/6!.

A001778

Lah numbers: a(n) = n!*binomial(n-1,5)/6!.

Terms

    a(0) =1a(1) =42a(2) =1176a(3) =28224a(4) =635040a(5) =13970880a(6) =307359360a(7) =6849722880a(8) =155831195520

External references