Expansion of sin(tan(x)^2)/2.A024281Expansion of sin(tan(x)^2)/2.Terms a(0) =0a(1) =1a(2) =8a(3) =76a(4) =-2752a(5) =-553904a(6) =-77878912a(7) =-11370511424External referencesoeis: A024281