Denominator of (2n+1) B_{2n}, where B_n are the Bernoulli numbers.

Terms

a(0) =1a(1) =2a(2) =6a(3) =6a(4) =10a(5) =6a(6) =210a(7) =2a(8) =30a(9) =42a(10) =110a(11) =6a(12) =546a(13) =2a(14) =30a(15) =462a(16) =170a(17) =6a(18) =51870a(19) =2a(20) =330a(21) =42a(22) =46a(23) =6a(24) =6630a(25) =22a(26) =30a(27) =798a(28) =290a(29) =6