Denominators of the swinging Bernoulli number b_n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =1a(4) =120a(5) =1a(6) =1512a(7) =1a(8) =17280a(9) =1a(10) =190080a(11) =1a(12) =1415232000a(13) =1a(14) =21772800a(15) =1a(16) =829108224000a(17) =1a(19) =1a(21) =1a(23) =1a(25) =1a(27) =1