G.f. A(x) satisfies: 1 = Sum_{n>=0} x^n / (A(x)^2 - x)^(2*n+1) * [ Sum_{k=0..n} C(n,k)^2 * x^k * A(x)^(n-2*k) ]^2.

A258053

G.f. A(x) satisfies: 1 = Sum_{n>=0} x^n / (A(x)^2 - x)^(2*n+1) * [ Sum_{k=0..n} C(n,k)^2 * x^k * A(x)^(n-2*k) ]^2.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =0a(4) =1a(5) =-2a(6) =-4a(7) =0a(8) =-7a(9) =20a(10) =42a(11) =0a(12) =84a(13) =-272a(14) =-584a(15) =0a(16) =-1239a(17) =4270a(18) =9288a(19) =0a(20) =20370a(21) =-72860a(22) =-159840a(23) =0a(24) =-358092a(25) =1312824a(26) =2897400a(27) =0a(28) =6587944a(29) =-24580512

External references