a(0) = 1; a(n) = 5 * Sum_{k=0..n} k * binomial(4*n+k,n-k)/(4*n+k).
A390714
a(0) = 1; a(n) = 5 * Sum_{k=0..n} k * binomial(4*n+k,n-k)/(4*n+k).
Terms
- a(0) =1a(1) =1a(2) =6a(3) =41a(4) =301a(5) =2311a(6) =18297a(7) =148158a(8) =1220534a(9) =10193005a(10) =86075121a(11) =733601936a(12) =6301301927a(13) =54488332154a(14) =473909547807
External references
- oeis: A390714