G.f. A(x) satisfies: Sum_{n>=0} A(x)^(n*(n+1)/2) * x^n = Sum_{n>=0} x^n / (1-x)^(n*(n-1)/2).
A326423
G.f. A(x) satisfies: Sum_{n>=0} A(x)^(n*(n+1)/2) * x^n = Sum_{n>=0} x^n / (1-x)^(n*(n-1)/2).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =11a(6) =39a(7) =147a(8) =598a(9) =2577a(10) =11669a(11) =55156a(12) =270938a(13) =1378577a(14) =7247494a(15) =39290662a(16) =219304105a(17) =1258592815a(18) =7418414658a(19) =44863100701a(20) =278117328554
External references
- oeis: A326423