a(n) = coefficient of x^(2*n) in A(x) = 1 + Sum_{n>=1} (-1)^n * x^(4*n^2) * (F(x/2)^(2*n) + F(-x/2)^(2*n)), where F(x) is the g.f. of A357787.

A357806

a(n) = coefficient of x^(2*n) in A(x) = 1 + Sum_{n>=1} (-1)^n * x^(4*n^2) * (F(x/2)^(2*n) + F(-x/2)^(2*n)), where F(x) is the g.f. of A357787.

Terms

    a(0) =1a(1) =0a(2) =-2a(3) =-4a(4) =-8a(5) =-12a(6) =-8a(7) =8a(8) =50a(9) =108a(10) =120a(11) =-68a(12) =-672a(13) =-1644a(14) =-1904a(15) =1912a(16) =15456a(17) =41160a(18) =59494a(19) =-5852a(20) =-311040a(21) =-996744a(22) =-1752680a(23) =-840600a(24) =5988928a(25) =24181500a(26) =50438488a(27) =45910304a(28) =-103373216a(29) =-582387300

External references