G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1+x)/(1+x^3).
A207386
G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1+x)/(1+x^3).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =28a(5) =172a(6) =1269a(7) =10879a(8) =106343a(9) =1167970a(10) =14241792a(11) =190919195a(12) =2790920003a(13) =44184957237a(14) =753152722642
External references
- oeis: A207386