a(n) = Denominator(-4*n^2*Zeta(1 - n)^2*(1 - 2^n)) for n >= 1, a(0) = 1.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =15a(5) =1a(6) =7a(7) =1a(8) =15a(9) =1a(10) =33a(11) =1a(12) =455a(13) =1a(14) =3a(15) =1a(16) =255a(17) =1a(18) =133a(19) =1a(20) =33a(21) =1a(22) =69a(23) =1a(24) =455a(25) =1a(26) =3a(27) =1a(28) =435a(29) =1