A054387 Numerators of coefficients of 1/2^(2n+1) in Newton's series for Pi.

0, -2, 1, 1, 1, 5, 7, 7, 33, 429, 715, 2431, 4199, 29393, 52003, 185725, 111435, 1938969, 17678835, 21607465, 119409675, 883631595, 109402007, 6116566755, 11435320455, 57176602275, 322476036831, 1215486600363, 2295919134019