a(n) = 1 + Sum_{k=0..n-1} (2*k+1) * a(k) * a(n-k-1).
A376125
a(n) = 1 + Sum_{k=0..n-1} (2*k+1) * a(k) * a(n-k-1).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =67a(4) =681a(5) =8556a(6) =126253a(7) =2124340a(8) =39991633a(9) =831271006a(10) =18893178381a(11) =465972248083
External references
- oeis: A376125