Denominator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).

Terms

a(0) =1a(1) =4a(2) =12a(3) =48a(4) =240a(5) =240a(6) =1680a(7) =6720a(8) =20160a(9) =4032a(10) =44352a(11) =44352a(12) =576576a(13) =576576a(14) =2882880a(15) =11531520a(16) =196035840a(17) =196035840a(18) =3724680960a(19) =3724680960a(20) =3724680960a(21) =3724680960a(22) =85667662080a(23) =85667662080a(24) =428338310400a(25) =428338310400