Denominator of Bernoulli(2n)/(2n!).

Terms

a(0) =2a(1) =12a(2) =120a(3) =504a(4) =1440a(5) =3168a(6) =3931200a(7) =8640a(8) =41126400a(9) =579156480a(10) =2395008000a(11) =1001548800a(13) =5748019200