G.f. A(x) satisfies: 1/(1-x) = Sum_{n>=0} x^n * (1+x)^(n^2) / A(x)^(n*(n+1)/2).
A325578
G.f. A(x) satisfies: 1/(1-x) = Sum_{n>=0} x^n * (1+x)^(n^2) / A(x)^(n*(n+1)/2).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =4a(7) =13a(8) =41a(9) =152a(10) =585a(11) =2408a(12) =10398a(13) =46922a(14) =220594a(15) =1075614a(16) =5429158a(17) =28296558a(18) =152028318a(19) =840671002a(20) =4778156476a(21) =27882129540a(22) =166867893396
External references
- oeis: A325578