G.f.: Sum_{n=-oo..+oo} x^(n*(n+1)/2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
A355345
G.f.: Sum_{n=-oo..+oo} x^(n*(n+1)/2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
Terms
- a(0) =2a(1) =-2a(2) =-5a(3) =6a(4) =-7a(5) =14a(6) =-6a(7) =-9a(8) =27a(9) =-30a(10) =10a(11) =-11a(12) =44a(13) =-77a(14) =55a(15) =-10a(16) =-13a(17) =65a(18) =-156a(19) =182a(20) =-91a(21) =14a(22) =-15a(23) =90a(24) =-275a(25) =450a(26) =-378a(27) =140a(28) =-14a(29) =-17
External references
- oeis: A355345