a(n) = [x^n] Product_{k>=0} ((1 + x^(2*k+1))/(1 - x^(2*k+1)))^n.

A291697

a(n) = [x^n] Product_{k>=0} ((1 + x^(2*k+1))/(1 - x^(2*k+1)))^n.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =44a(4) =256a(5) =1512a(6) =9056a(7) =54896a(8) =335872a(9) =2069774a(10) =12827888a(11) =79875996a(12) =499305472a(13) =3131436856a(14) =19694403520a(15) =124165133424a(16) =784478240768

External references