a(n) = Sum_{k=0..n} binomial(4*n,k) * binomial(2*n-k-1,n-k).
A370100
a(n) = Sum_{k=0..n} binomial(4*n,k) * binomial(2*n-k-1,n-k).
Terms
- a(0) =1a(1) =5a(2) =47a(3) =500a(4) =5615a(5) =65005a(6) =767396a(7) =9183144a(8) =110995695a(9) =1351922495a(10) =16566597047a(11) =204010570296
External references
- oeis: A370100