a(n) = [x^n] Product_{k>=1} 1/((1 - x^k)*(1 - x^(2*k)))^n.
A319457
a(n) = [x^n] Product_{k>=1} 1/((1 - x^k)*(1 - x^(2*k)))^n.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =31a(4) =175a(5) =931a(6) =5209a(7) =29114a(8) =165087a(9) =940828a(10) =5396777a(11) =31090962a(12) =179832625a(13) =1043516371a(14) =6072302726a(15) =35420582431a(16) =207051636799
External references
- oeis: A319457