Denominator of Sum_{i+j+k=n, i,j,k>=1} (i*j)/k.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =12a(6) =15a(7) =30a(8) =21a(9) =168a(10) =126a(11) =1260a(12) =990a(13) =792a(14) =1287a(15) =18018a(16) =5005a(17) =80080a(18) =68068a(19) =58344a(20) =50388a(21) =201552a(22) =176358a(23) =3879876a(24) =3432198a(25) =27457584a(26) =24515700a(27) =637408200a(28) =573667380a(29) =16062686640