Expansion of g.f. Sum_{n>=1} q^n/(1-q^n-q^(3*n)).

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =7a(6) =7a(7) =13a(8) =15a(9) =24a(10) =29a(11) =50a(12) =61a(13) =96a(14) =134a(15) =202a(16) =278a(17) =426a(18) =596a(19) =898a(20) =1286a(21) =1903a(22) =2746a(23) =4082a(24) =5900a(25) =8703a(26) =12679a(27) =18658a(28) =27202a(29) =40023