Expansion of Product_{i>=1, j>=1} (1 + x^(i*(2*j - 1))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =8a(7) =10a(8) =14a(9) =21a(10) =28a(11) =36a(12) =51a(13) =65a(14) =86a(15) =117a(16) =148a(17) =190a(18) =251a(19) =316a(20) =402a(21) =519a(22) =647a(23) =814a(24) =1032a(25) =1282a(26) =1593a(27) =1994a(28) =2457a(29) =3029