a(n) = Sum_{k=0..n} binomial(n,k) * binomial(5*k,k) / (4*k + 1).
A346647
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(5*k,k) / (4*k + 1).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =54a(4) =460a(5) =4361a(6) =43988a(7) =462580a(8) =5014252a(9) =55624944a(10) =628432101a(11) =7205500484a(12) =83632219892a(13) =980710882430
External references
- oeis: A346647