a(n) = !n + n * n!, where !n = A000166(n) is subfactorial of n.

A334716

a(n) = !n + n * n!, where !n = A000166(n) is subfactorial of n.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =20a(4) =105a(5) =644a(6) =4585a(7) =37134a(8) =337393a(9) =3399416a(10) =37622961a(11) =453769370a(12) =5924234041a(13) =83242063332

External references