a(n) = A121676(n)/(n+1) = [x^n] (1 + x*(1+x)^(n-1) )^(n+1) / (n+1).

A121677

a(n) = A121676(n)/(n+1) = [x^n] (1 + x*(1+x)^(n-1) )^(n+1) / (n+1).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =8a(4) =50a(5) =402a(6) =3932a(7) =45075a(8) =588450a(9) =8580542a(10) =137799497a(11) =2410575026a(12) =45531000715a(13) =921946835474

External references