a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(n - k) * binomial(n,k) * a(k-1) * a(n-k).
A331404
a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(n - k) * binomial(n,k) * a(k-1) * a(n-k).
Terms
- a(0) =1a(1) =1a(2) =-1a(3) =-7a(4) =19a(5) =229a(6) =-1009a(7) =-17263a(8) =105211a(9) =2332141a(10) =-18148681a(11) =-494079367a(12) =4678377859a(13) =151026527989
External references
- oeis: A331404