G.f.: 1/(1 - x - x^2 - x^3 + x^5 + x^6 + x^7).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =12a(6) =21a(7) =36a(8) =62a(9) =106a(10) =181a(11) =309a(12) =527a(13) =898a(14) =1530a(15) =2606a(16) =4438a(17) =7557a(18) =12867a(19) =21907a(20) =37297a(21) =63497a(22) =108100a(23) =184032a(24) =313298a(25) =533359a(26) =907988a(27) =1545751a(28) =2631469a(29) =4479778