-3823

Appears in sequences

• Expansion of e.g.f. sec(sin(arctan(x))) = 1/cos(x/sqrt(1+x^2)) (even powers only).at n=4A012028
• Coefficients in the expansion of 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = 5/4.at n=29A279677