a(1)=1, a(2)=1, a(n) = (n-1)*a(n-1) - (n-2)*a(n-2) - ... - a(1) for n>=3.
A106539
a(1)=1, a(2)=1, a(n) = (n-1)*a(n-1) - (n-2)*a(n-2) - ... - a(1) for n>=3.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-6a(5) =-36a(6) =-192a(7) =-1104a(8) =-7248a(9) =-54816a(10) =-472512a(11) =-4573824a(12) =-49064448a(13) =-577130496a(14) =-7381281792a(15) =-101940854784
External references
- oeis: A106539