Denominators of coefficients in expansion of e.g.f. x / (1 + 2*x - exp(x)).

Terms

a(0) =1a(1) =2a(2) =6a(3) =1a(4) =30a(5) =3a(6) =42a(7) =1a(8) =90a(9) =5a(10) =22a(11) =1a(12) =2730a(13) =35a(14) =90a(15) =3a(16) =1530a(17) =45a(18) =3990a(19) =35a(20) =6930a(21) =33a(22) =2070a(23) =45a(24) =40950a(25) =91a(26) =378a(27) =7a(28) =870a(29) =15