a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+4*k-1,n-k).
A389323
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+4*k-1,n-k).
Terms
- a(0) =1a(1) =1a(2) =11a(3) =76a(4) =531a(5) =3851a(6) =28382a(7) =211548a(8) =1590899a(9) =12047170a(10) =91734911a(11) =701710109a(12) =5387995098a(13) =41504066813a(14) =320589683754
External references
- oeis: A389323