a(n) = Sum_{k=0..n} binomial(n+k, k)*binomial(n+k+1, k+1)/(n+1).
A185655
a(n) = Sum_{k=0..n} binomial(n+k, k)*binomial(n+k+1, k+1)/(n+1).
Terms
- a(0) =1a(1) =4a(2) =27a(3) =236a(4) =2375a(5) =26090a(6) =304241a(7) =3704860a(8) =46622655a(9) =602035556a(10) =7937288062a(11) =106451074614
External references
- oeis: A185655