G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1-x^3)/(1-x).
A207433
G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1-x^3)/(1-x).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =56a(5) =350a(6) =2609a(7) =22582a(8) =222625a(9) =2462969a(10) =30219676a(11) =407276420a(12) =5981197376a(13) =95073427910
External references
- oeis: A207433