G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is a g.f. of the Catalan numbers (A000108).
A356777
G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is a g.f. of the Catalan numbers (A000108).
Terms
- a(0) =1a(1) =1a(2) =-3a(3) =0a(4) =1a(5) =-5a(6) =5a(7) =0a(8) =0a(9) =1a(10) =-7a(11) =14a(12) =-7a(13) =0a(14) =0a(15) =0a(16) =1a(17) =-9a(18) =27a(19) =-30a(20) =9a(21) =0a(22) =0a(23) =0a(24) =0a(25) =1a(26) =-11a(27) =44a(28) =-77a(29) =55
External references
- oeis: A356777