a(0) = a(1) = 1; for n > 0, a(n+1) = a(n)*(a(0) + ... + a(n-1)) + a(n)*(a(n) + 1)/2.
A002658
a(0) = a(1) = 1; for n > 0, a(n+1) = a(n)*(a(0) + ... + a(n-1)) + a(n)*(a(n) + 1)/2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =56a(5) =2212a(6) =2595782
External references
- oeis: A002658