Denominator of B_{2n}/(-4n), where B_m are the Bernoulli numbers.

Terms

a(0) =1a(1) =24a(2) =240a(3) =504a(4) =480a(5) =264a(6) =65520a(7) =24a(8) =16320a(9) =28728a(10) =13200a(11) =552a(12) =131040a(13) =24a(14) =6960a(15) =171864a(16) =32640a(17) =24a(18) =138181680a(19) =24a(20) =1082400a(21) =151704a(22) =5520a(23) =1128a(24) =4455360a(25) =264a(26) =12720a(27) =86184a(28) =13920a(29) =1416