a(n) = sum_{k=0..n} binomial(n,k)^4 * 3^k.
A216795
a(n) = sum_{k=0..n} binomial(n,k)^4 * 3^k.
Terms
- a(0) =1a(1) =4a(2) =58a(3) =1000a(4) =19426a(5) =412744a(6) =9195796a(7) =212836432a(8) =5062716850a(9) =123033947464
External references
- oeis: A216795