a(n) = Sum_{k=0..n} binomial(k+n+3,k)*binomial(2*n+1,n-k).
A278596
a(n) = Sum_{k=0..n} binomial(k+n+3,k)*binomial(2*n+1,n-k).
Terms
- a(0) =1a(1) =8a(2) =61a(3) =462a(4) =3504a(5) =26664a(6) =203632a(7) =1560416a(8) =11994112a(9) =92445184a(10) =714258944a(11) =5530504192a(12) =42905149440a(13) =333427783680
External references
- oeis: A278596