Expansion of tan(tan(x)*sin(x))/2.A024245Expansion of tan(tan(x)*sin(x))/2.Terms a(0) =0a(1) =1a(2) =2a(3) =151a(4) =4052a(5) =473821a(6) =43427702a(7) =8101954771External referencesoeis: A024245