a(n) = (2 * a(n-3) + a(n-1) * a(n-5)) / a(n-6), a(0) = a(1) = ... = a(5) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =5a(8) =7a(9) =13a(10) =23a(11) =83a(12) =147a(13) =215a(14) =423a(15) =771a(16) =2801a(17) =4971a(18) =7281a(19) =14351a(20) =26181a(21) =95133a(22) =168845a(23) =247317a(24) =487493a(25) =889373a(26) =3231703a(27) =5735737a(28) =8401475a(29) =16560393