Denominators of coefficients of expansion of arctan(x)^2 = x^2-2/3*x^4+23/45*x^6-44/105*x^8+563/1575*x^10-3254/10395*x^12+ ...

A071968

Denominators of coefficients of expansion of arctan(x)^2 = x^2-2/3*x^4+23/45*x^6-44/105*x^8+563/1575*x^10-3254/10395*x^12+ ...

Terms

    a(0) =1a(1) =1a(2) =3a(3) =45a(4) =105a(5) =1575a(6) =10395a(7) =315315a(8) =45045a(9) =6891885a(10) =72747675a(11) =160044885a(12) =1003917915a(13) =21751554825a(14) =35137127025

External references