Denominators of the partial sums of the reciprocals of Pillai's arithmetical function (A018804).

Terms

a(0) =1a(1) =3a(2) =15a(3) =120a(4) =360a(5) =360a(6) =4680a(7) =4680a(8) =32760a(9) =98280a(10) =98280a(11) =12285a(12) =61425a(13) =61425a(14) =61425a(15) =982800a(16) =10810800a(17) =1544400a(18) =57142800a(19) =57142800a(20) =57142800a(21) =399999600a(22) =399999600a(23) =79999920a(24) =1230768a(25) =30769200a(26) =92307600a(27) =1199998800a(28) =22799977200a(29) =22799977200