Expansion of Product_{k>=1} (1 + x^k + x^(k^2)).

Terms

a(0) =1a(1) =2a(2) =1a(3) =3a(4) =4a(5) =6a(6) =6a(7) =8a(8) =12a(9) =15a(10) =20a(11) =22a(12) =30a(13) =35a(14) =46a(15) =53a(16) =67a(17) =80a(18) =97a(19) =117a(20) =138a(21) =165a(22) =195a(23) =231a(24) =272a(25) =323a(26) =378a(27) =442a(28) =514a(29) =600