G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1+x)/(1+x^2).
A207397
G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1+x)/(1+x^2).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =11a(5) =74a(6) =557a(7) =4799a(8) =47004a(9) =516717a(10) =6302993a(11) =84502346a(12) =1235198136a(13) =19552296646a(14) =333212892221
External references
- oeis: A207397