a(n) = Sum_{k=0..n} 2^k * binomial(n,k) * binomial(4*n+1,k).
A388046
a(n) = Sum_{k=0..n} 2^k * binomial(n,k) * binomial(4*n+1,k).
Terms
- a(0) =1a(1) =11a(2) =181a(3) =3303a(4) =63241a(5) =1244979a(6) =24957661a(7) =506750351a(8) =10387323409a(9) =214483106715
External references
- oeis: A388046