a(n) = a(n-1) + a(n-2) + 7 where a(0) = a(1) = 1.

Terms

a(0) =1a(1) =1a(2) =9a(3) =17a(4) =33a(5) =57a(6) =97a(7) =161a(8) =265a(9) =433a(10) =705a(11) =1145a(12) =1857a(13) =3009a(14) =4873a(15) =7889a(16) =12769a(17) =20665a(18) =33441a(19) =54113a(20) =87561a(21) =141681a(22) =229249a(23) =370937a(24) =600193a(25) =971137a(26) =1571337a(27) =2542481a(28) =4113825a(29) =6656313