G.f. satisfies: x = Sum_{n>=1} 1/A(x)^(3*n) * Product_{k=1..n} (1 - 1/A(x)^k).
A181997
G.f. satisfies: x = Sum_{n>=1} 1/A(x)^(3*n) * Product_{k=1..n} (1 - 1/A(x)^k).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =46a(5) =259a(6) =1539a(7) =9484a(8) =59961a(9) =386319a(10) =2524940a(11) =16687599a(12) =111264335a(13) =747080253a(14) =5044629212a(15) =34218868880a(16) =232964088130
External references
- oeis: A181997