Denominator in Feinler's formula for unsigned Bernoulli number |B_{2n}|.

Terms

a(0) =1a(1) =6a(2) =30a(3) =84a(4) =90a(5) =132a(6) =5460a(7) =360a(8) =1530a(9) =7980a(10) =13860a(11) =8280a(12) =81900a(13) =1512a(14) =3480a(15) =114576a(16) =117810a(17) =1260a(18) =3838380a(19) =32760a(20) =568260a(21) =1191960a(22) =869400a(23) =236880a(24) =9746100a(25) =525096a(26) =629640a(27) =351120a(28) =198360a(29) =42480