a(n) = n! * (1 + Sum_{k=0..n} (-1)^k * binomial(k+1,2) / k!).
A368766
a(n) = n! * (1 + Sum_{k=0..n} (-1)^k * binomial(k+1,2) / k!).
Terms
- a(0) =1a(1) =0a(2) =3a(3) =3a(4) =22a(5) =95a(6) =591a(7) =4109a(8) =32908a(9) =296127a(10) =2961325a(11) =32574509a(12) =390894186a(13) =5081624327a(14) =71142740683
External references
- oeis: A368766