a(n) = 2*Sum_{k=0..n-1} {[x^k] A(x)^(n-k)} * {[x^(n-k-1)] A(x)^(k+1)/(k+1)} for n>0, with a(0)=1, where g.f. A(x) = Sum_{n>=0} a(n)*x^n.
A211195
a(n) = 2*Sum_{k=0..n-1} {[x^k] A(x)^(n-k)} * {[x^(n-k-1)] A(x)^(k+1)/(k+1)} for n>0, with a(0)=1, where g.f. A(x) = Sum_{n>=0} a(n)*x^n.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =32a(4) =240a(5) =2232a(6) =24080a(7) =290048a(8) =3809088a(9) =53691840a(10) =803569184a(11) =12670027776a(12) =209244552192
External references
- oeis: A211195