Coefficient of x^2 in expansion of (x+3) * (x+7) * ... * (x+4*n-1).
A383702
Coefficient of x^2 in expansion of (x+3) * (x+7) * ... * (x+4*n-1).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =21a(4) =446a(5) =10670a(6) =290599a(7) =8951355a(8) =308846124a(9) =11822475564a(10) =497794079421
External references
- oeis: A383702