Fibonacci sequence beginning 5, 18.

Terms

a(0) =5a(1) =18a(2) =23a(3) =41a(4) =64a(5) =105a(6) =169a(7) =274a(8) =443a(9) =717a(10) =1160a(11) =1877a(12) =3037a(13) =4914a(14) =7951a(15) =12865a(16) =20816a(17) =33681a(18) =54497a(19) =88178a(20) =142675a(21) =230853a(22) =373528a(23) =604381a(24) =977909a(25) =1582290a(26) =2560199a(27) =4142489a(28) =6702688a(29) =10845177