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

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =31a(5) =82a(6) =241a(7) =664a(8) =1898a(9) =5316a(10) =15058a(11) =42374a(12) =119718a(13) =337432a(14) =952373a(15) =2685906a(16) =7578248a(17) =21376331a(18) =60306495a(19) =170120330a(20) =479922212a(21) =1353855927a(22) =3819280961a(23) =10774233218a(24) =30394408336a(25) =85743168417a(26) =241883489742a(27) =682358211402