Expansion of Product_{k>=1} 1/(1 - x^k - x^(2*k) - x^(3*k)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =13a(5) =24a(6) =51a(7) =93a(8) =184a(9) =343a(10) =654a(11) =1211a(12) =2286a(13) =4217a(14) =7865a(15) =14521a(16) =26912a(17) =49600a(18) =91669a(19) =168800a(20) =311305a(21) =573058a(22) =1055576a(23) =1942437a(24) =3575840a(25) =6578762a(26) =12106121a(27) =22270404a(28) =40972700a(29) =75367724