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

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =5a(5) =3a(6) =35a(7) =1a(8) =15a(9) =7a(10) =11a(11) =3a(12) =91a(13) =1a(14) =15a(15) =77a(16) =85a(17) =3a(18) =8645a(19) =1a(20) =33a(21) =1a(22) =23a(23) =3a(24) =1105a(25) =11a(26) =15a(27) =133a(28) =145a(29) =3