Write cosec x = 1/x + Sum e_n x^(2n-1)/(2n-1)!; sequence gives denominators of e_n.

Terms

a(0) =6a(1) =60a(2) =126a(3) =120a(4) =66a(5) =16380a(6) =6a(7) =4080a(8) =7182a(9) =3300a(10) =138a(11) =32760a(12) =6a(13) =1740a(14) =42966a(15) =8160a(16) =6a(17) =34545420a(18) =6a(19) =270600a(20) =37926a(21) =1380a(22) =282a(23) =1113840a(24) =66a(25) =3180a(26) =21546a(27) =3480a(28) =354a(29) =1703601900