a(n) = Sum_{k=0..n} C(n-1,k)^2*a(k)*a(n-k-1) for n>0 with a(0)=1.
A132228
a(n) = Sum_{k=0..n} C(n-1,k)^2*a(k)*a(n-k-1) for n>0 with a(0)=1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =52a(5) =504a(6) =6808a(7) =122304a(8) =2820048a(9) =81183200a(10) =2853990496a(11) =120321094656
External references
- oeis: A132228