a(n) = n! * Sum_{k=0..n} (-1)^(n-k) * binomial(k+3,4) / k!.
A368586
a(n) = n! * Sum_{k=0..n} (-1)^(n-k) * binomial(k+3,4) / k!.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =6a(4) =11a(5) =15a(6) =36a(7) =-42a(8) =666a(9) =-5499a(10) =55705a(11) =-611754a(12) =7342413a(13) =-95449549a(14) =1336296066a(15) =-20044437930a(16) =320711010756
External references
- oeis: A368586