a(0) = 1; a(n) = Sum_{k=0..n} k * binomial(4*n-2*k,n-k)/(2*n-k).
A390713
a(0) = 1; a(n) = Sum_{k=0..n} k * binomial(4*n-2*k,n-k)/(2*n-k).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =14a(4) =81a(5) =528a(6) =3706a(7) =27343a(8) =209091a(9) =1642505a(10) =13175592a(11) =107475228a(12) =888788286a(13) =7434421879a(14) =62790108909a(15) =534724808122
External references
- oeis: A390713