a(n) = 1 + Sum_{k=1..n-1} binomial(n-2,k-1) * a(k) * a(n-k-1).
A335441
a(n) = 1 + Sum_{k=1..n-1} binomial(n-2,k-1) * a(k) * a(n-k-1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =40a(6) =176a(7) =907a(8) =5360a(9) =35668a(10) =263789a(11) =2146390a(12) =19054040a(13) =183248581a(14) =1897952690a(15) =21061861828a(16) =249309196559
External references
- oeis: A335441