a(n) = number of solutions to an equation x_1 + ... + x_j =0 with 1<=j<=n satisfying -n<=x_i<=n (1<=i<=j).
A160492
a(n) = number of solutions to an equation x_1 + ... + x_j =0 with 1<=j<=n satisfying -n<=x_i<=n (1<=i<=j).
Terms
- a(0) =1a(1) =6a(2) =45a(3) =560a(4) =9795a(5) =223524a(6) =6284089a(7) =210208560a(8) =8156750283a(9) =360297117070
External references
- oeis: A160492