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

Terms

a(0) =1a(1) =1a(2) =7a(3) =16a(4) =64a(5) =133a(6) =465a(7) =1008a(8) =3023a(9) =6695a(10) =18206a(11) =40175a(12) =103229a(13) =225470a(14) =549873a(15) =1194620a(16) =2801742a(17) =6015042a(18) =13686306a(19) =29063919a(20) =64424496a(21) =135362432a(22) =293512852a(23) =610061141a(24) =1298516539a(25) =2670738781a(26) =5591712472a(27) =11388116508a(28) =23499720744a(29) =47403692965