a(n) = [x^n] (1-x)^(4*n+1) * Sum_{k>=0} binomial(n+k-1,k)^4 * x^k.
A262015
a(n) = [x^n] (1-x)^(4*n+1) * Sum_{k>=0} binomial(n+k-1,k)^4 * x^k.
Terms
- a(0) =1a(1) =11a(2) =603a(3) =49682a(4) =4961755a(5) =554083761a(6) =66555527346
External references
- oeis: A262015