G.f.: 1/((1-t^6)*(1-t)*(1-t^3)*(1-t^5)*(1-t^7)*(1-t^9)*(1-t^11)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =5a(7) =6a(8) =7a(9) =10a(10) =12a(11) =15a(12) =20a(13) =23a(14) =28a(15) =35a(16) =41a(17) =49a(18) =60a(19) =69a(20) =81a(21) =97a(22) =111a(23) =129a(24) =151a(25) =172a(26) =197a(27) =228a(28) =258a(29) =293