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

Terms

a(0) =0a(1) =0a(2) =1a(3) =9a(4) =37a(5) =319a(6) =743a(7) =2509a(8) =2761a(9) =32891a(10) =35201a(11) =485333a(12) =511073a(13) =535097a(14) =1115239a(15) =19679783a(16) =6786821a(17) =133033679a(18) =136913555a(19) =140608675a(20) =144135835a(21) =678544345a(22) =693417203a(23) =17692378667a(24) =18035598467a(25) =165294957803a(26) =168163294703