G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(4*n-4), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
A356778
G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(4*n-4), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
Terms
- a(0) =1a(1) =-2a(2) =-6a(3) =20a(4) =-15a(5) =-10a(6) =54a(7) =-112a(8) =105a(9) =-35a(10) =-14a(11) =104a(12) =-352a(13) =660a(14) =-672a(15) =336a(16) =-63a(17) =-18a(18) =170a(19) =-800a(20) =2275a(21) =-4004a(22) =4290a(23) =-2640a(24) =825a(25) =-99a(26) =-22a(27) =252a(28) =-1520a(29) =5814
External references
- oeis: A356778