Expansion of Product_{i>=1, j>=1, k>=1} ((1 + x^(i*j*k))/(1 - x^(i*j*k)))^(i*j*k).

Terms

a(0) =1a(1) =2a(2) =14a(3) =44a(4) =182a(5) =548a(6) =1932a(7) =5632a(8) =17654a(9) =49872a(10) =145020a(11) =395256a(12) =1090044a(13) =2876424a(14) =7606024a(15) =19503312a(16) =49850790a(17) =124543772a(18) =309436980a(19) =755268832a(20) =1831194724a(21) =4376807896a(22) =10387118328a(23) =24359228520a(24) =56720659372a(25) =130737105940a(26) =299256890672a(27) =678941040784