G.f.: Sum_{n=-oo..+oo} x^(n*(n+1)/2) * C(x)^(4*n-6), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
A355864
G.f.: Sum_{n=-oo..+oo} x^(n*(n+1)/2) * C(x)^(4*n-6), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
Terms
- a(0) =2a(1) =-14a(2) =28a(3) =26a(4) =-203a(5) =427a(6) =-741a(7) =1314a(8) =-1575a(9) =264a(10) =3201a(11) =-7953a(12) =11308a(13) =-11440a(14) =13364a(15) =-26403a(16) =50479a(17) =-68549a(18) =59956a(19) =-19930a(20) =-50743a(21) =165880a(22) =-319635a(23) =436575a(24) =-424830a(25) =308193a(26) =-258570a(27) =488410a(28) =-1122459a(29) =2043162
External references
- oeis: A355864