a(n) = 1/n! * Sum_{k=0..n} (2*n+k)!/((n-k)!*k!*2^k).
A307376
a(n) = 1/n! * Sum_{k=0..n} (2*n+k)!/((n-k)!*k!*2^k).
Terms
- a(0) =1a(1) =5a(2) =81a(3) =2330a(4) =97405a(5) =5360607a(6) =366432990a(7) =29948982492
External references
- oeis: A307376
A307376
a(n) = 1/n! * Sum_{k=0..n} (2*n+k)!/((n-k)!*k!*2^k).