Fibonacci sequence beginning 12, 7.

Terms

a(0) =12a(1) =7a(2) =19a(3) =26a(4) =45a(5) =71a(6) =116a(7) =187a(8) =303a(9) =490a(10) =793a(11) =1283a(12) =2076a(13) =3359a(14) =5435a(15) =8794a(16) =14229a(17) =23023a(18) =37252a(19) =60275a(20) =97527a(21) =157802a(22) =255329a(23) =413131a(24) =668460a(25) =1081591a(26) =1750051a(27) =2831642a(28) =4581693a(29) =7413335