Denominators of exponential transform of 1/n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =3a(5) =5a(6) =180a(7) =1260a(8) =105a(9) =945a(10) =9450a(11) =34650a(12) =155925a(13) =289575a(14) =12612600a(15) =1702701000a(16) =212837625a(17) =1206079875a(18) =21709437750a(19) =412479317250a(20) =2888510625