Denominators of cosecant numbers: -2*(2^(2*n-1)-1)*Bernoulli(2*n).

Terms

a(0) =1a(1) =3a(2) =15a(3) =21a(4) =15a(5) =33a(6) =1365a(7) =3a(8) =255a(9) =399a(10) =165a(11) =69a(12) =1365a(13) =3a(14) =435a(15) =7161a(16) =255a(17) =3a(18) =959595a(19) =3a(20) =6765a(21) =903a(22) =345a(23) =141a(24) =23205a(25) =33a(26) =795a(27) =399a(28) =435a(29) =177