E.g.f.: 1/(1 + Sum_{n>=1} (-1)^n*x^(n*(3*n-1)/2)/(n*(3*n-1)/2)! + (-1)^n*x^(n*(3*n+1)/2)/(n*(3*n+1)/2)! ).

A199746

E.g.f.: 1/(1 + Sum_{n>=1} (-1)^n*x^(n*(3*n-1)/2)/(n*(3*n-1)/2)! + (-1)^n*x^(n*(3*n+1)/2)/(n*(3*n+1)/2)! ).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =12a(4) =66a(5) =449a(6) =3678a(7) =35111a(8) =383192a(9) =4704300a(10) =64172052a(11) =962908056a(12) =15762088585a(13) =279514500434

External references