G.f. A(x) satisfies A(x) = 1 / (1 - x * A(x^6)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =7a(13) =9a(14) =12a(15) =16a(16) =21a(17) =27a(18) =34a(19) =43a(20) =55a(21) =71a(22) =92a(23) =119a(24) =153a(25) =196a(26) =251a(27) =322a(28) =414a(29) =533