a(n) = [x^n] (theta_3(x^(1/2))^n + theta_4(x^(1/2))^n)/2, where theta_3() and theta_4() are the Jacobi theta functions.

A303333

a(n) = [x^n] (theta_3(x^(1/2))^n + theta_4(x^(1/2))^n)/2, where theta_3() and theta_4() are the Jacobi theta functions.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =24a(4) =24a(5) =560a(6) =2080a(7) =11088a(8) =74864a(9) =343536a(10) =2050344a(11) =11676280a(12) =61903776a(13) =363737712a(14) =2022013760a(15) =11335886864a(16) =65187410400a(17) =365627715968

External references