Coefficient of x^n in expansion of (1+n*x+(n+1)*x^2)^n.
A187019
Coefficient of x^n in expansion of (1+n*x+(n+1)*x^2)^n.
Terms
- a(0) =1a(1) =1a(2) =10a(3) =99a(4) =1366a(5) =23525a(6) =484436a(7) =11582375a(8) =314830342a(9) =9576682569a(10) =322014499852
External references
- oeis: A187019