a(n) = Sum_{k=0..n} binomial(4*n+3*k+1,n-k).
A390415
a(n) = Sum_{k=0..n} binomial(4*n+3*k+1,n-k).
Terms
- a(0) =1a(1) =6a(2) =49a(3) =426a(4) =3800a(5) =34369a(6) =313536a(7) =2877073a(8) =26512748a(9) =245104797a(10) =2271644202a(11) =21096344235a(12) =196244091617
External references
- oeis: A390415