a(n) equals the coefficient of x^(2*n-1) in the n-th iteration of x+x^2 for n>=1.
A194971
a(n) equals the coefficient of x^(2*n-1) in the n-th iteration of x+x^2 for n>=1.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =188a(4) =8994a(5) =832680a(6) =127104492a(7) =28951041456
External references
- oeis: A194971