Denominators of third-order harmonic numbers (defined by Conway and Guy, 1996).

Terms

a(0) =1a(1) =2a(2) =6a(3) =4a(4) =20a(5) =10a(6) =70a(7) =56a(8) =504a(9) =420a(10) =4620a(11) =3960a(12) =3432a(13) =6006a(14) =90090a(15) =80080a(16) =1361360a(17) =408408a(18) =369512a(19) =67184a(20) =470288a(21) =1293292a(22) =29745716a(23) =27457584a(24) =228813200a(25) =212469400a(26) =5736673800a(27) =5354228880a(28) =155272637520a(29) =291136195350