Denominators of expansion of e.g.f. x^2/(2*(cos(x)-1)), even powers only.

Terms

a(0) =1a(1) =6a(2) =10a(3) =42a(4) =30a(5) =22a(6) =2730a(7) =6a(8) =34a(9) =798a(10) =330a(11) =46a(12) =2730a(13) =6a(14) =290a(15) =14322a(16) =510a(17) =2a(18) =54834a(19) =6a(20) =4510a(21) =1806a(22) =690a(23) =94a(24) =46410a(25) =66a(26) =530a(27) =798a(28) =174a(29) =118