G.f.: Product_{k>=1} (1 + x^(3*k^2)) / (1 - x^k).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =14a(7) =20a(8) =29a(9) =41a(10) =57a(11) =78a(12) =108a(13) =144a(14) =193a(15) =257a(16) =338a(17) =441a(18) =575a(19) =741a(20) =953a(21) =1218a(22) =1549a(23) =1960a(24) =2474a(25) =3103a(26) =3882a(27) =4839a(28) =6009a(29) =7435