a(n) = A121678(n)/(n+1) = [x^n] (1 + x*(1+x)^n )^(n+1) / (n+1).
A121679
a(n) = A121678(n)/(n+1) = [x^n] (1 + x*(1+x)^n )^(n+1) / (n+1).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =85a(5) =706a(6) =7042a(7) =81887a(8) =1081257a(9) =15911488a(10) =257476901a(11) =4533396418a(12) =86110501919
External references
- oeis: A121679