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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =14a(7) =19a(8) =32a(9) =44a(10) =67a(11) =91a(12) =139a(13) =186a(14) =269a(15) =362a(16) =517a(17) =686a(18) =958a(19) =1264a(20) =1741a(21) =2286a(22) =3092a(23) =4033a(24) =5416a(25) =7018a(26) =9296a(27) =11998a(28) =15769a(29) =20228