a(n) = (6^n/n!)*Product_{k=0..n-1} (6*k + 5).

A004994

a(n) = (6^n/n!)*Product_{k=0..n-1} (6*k + 5).

Terms

    a(0) =1a(1) =30a(2) =990a(3) =33660a(4) =1161270a(5) =40412196a(6) =1414426860a(7) =49707001080

External references