Denominators of e.g.f.: -cot(arctanh(x)), odd powers only.

Terms

a(0) =3a(1) =3a(2) =63a(3) =9a(4) =11a(5) =63a(6) =63a(7) =9a(8) =3591a(9) =693a(10) =2277a(11) =189a(12) =189a(13) =21a(14) =7161a(15) =77a(16) =21a(17) =3591a(18) =171a(19) =99a(20) =625779a(21) =47817a(22) =68103a(23) =1323a(24) =297a(25) =297a(26) =16929a(27) =171a(28) =531a(29) =64449