Denominators from e.g.f. 1/(1-exp(-x)) - 1/x.

Terms

a(0) =2a(1) =12a(2) =1a(3) =120a(4) =1a(5) =252a(6) =1a(7) =240a(8) =1a(9) =132a(10) =1a(11) =32760a(12) =1a(13) =12a(14) =1a(15) =8160a(16) =1a(17) =14364a(18) =1a(19) =6600a(20) =1a(21) =276a(22) =1a(23) =65520a(24) =1a(25) =12a(26) =1a(27) =3480a(28) =1a(29) =85932