a(n) is the denominator of polygamma(2n+1, 1) / Pi^(2n+2).

Terms

a(0) =6a(1) =15a(2) =63a(3) =15a(4) =33a(5) =4095a(6) =3a(7) =255a(8) =3591a(9) =825a(10) =69a(11) =4095a(12) =3a(13) =435a(14) =21483a(15) =255a(16) =3a(17) =8636355a(18) =3a(19) =33825a(20) =18963a(21) =345a(22) =141a(23) =69615a(24) =33a(25) =795a(26) =10773a(27) =435a(28) =177a(29) =425900475