a(n+1) = a(n) - n*(n-1)*a(n-1), with a(n) = 1 for n <= 3.
A002020
a(n+1) = a(n) - n*(n-1)*a(n-1), with a(n) = 1 for n <= 3.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-5a(5) =-17a(6) =83a(7) =593a(8) =-2893a(9) =-36101a(10) =172195a(11) =3421285a(12) =-15520165a(13) =-467129785a(14) =1954015955a(15) =86971636825a(16) =-323371713725
External references
- oeis: A002020