Denominator of -16/((n+2)*n*(n-2)*(n-4)).

Terms

a(0) =9a(1) =0a(2) =15a(3) =0a(4) =105a(5) =24a(6) =945a(7) =120a(8) =3465a(9) =360a(10) =9009a(11) =840a(12) =19305a(13) =1680a(14) =36465a(15) =3024a(16) =62985a(17) =5040a(18) =101745a(19) =7920a(20) =156009a(21) =11880a(22) =229425a(23) =17160a(24) =326025a(25) =24024a(26) =450225a(27) =32760a(28) =606825a(29) =43680