Expansion of g.f. Sum_{n>=1} q^n/(1-q^n-q^(2*n)-q^(3*n)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =17a(6) =25a(7) =50a(8) =84a(9) =158a(10) =275a(11) =525a(12) =928a(13) =1731a(14) =3146a(15) =5818a(16) =10610a(17) =19611a(18) =35891a(19) =66174a(20) =121442a(21) =223593a(22) =410745a(23) =756045a(24) =1389545a(25) =2556686a(26) =4700854a(27) =8647799a(28) =15902592a(29) =29252734