Denominator of Sum_{k=1..n} d(k)/k, where d() = A000005().

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =60a(5) =60a(6) =420a(7) =420a(8) =420a(9) =420a(10) =4620a(11) =4620a(12) =60060a(13) =60060a(14) =60060a(15) =240240a(16) =4084080a(17) =4084080a(18) =77597520a(19) =77597520a(20) =25865840a(21) =25865840a(22) =594914320a(23) =1784742960a(24) =8923714800a(25) =8923714800a(26) =80313433200a(27) =80313433200