Fibonacci sequence beginning 1, 20.

Terms

a(0) =1a(1) =20a(2) =21a(3) =41a(4) =62a(5) =103a(6) =165a(7) =268a(8) =433a(9) =701a(10) =1134a(11) =1835a(12) =2969a(13) =4804a(14) =7773a(15) =12577a(16) =20350a(17) =32927a(18) =53277a(19) =86204a(20) =139481a(21) =225685a(22) =365166a(23) =590851a(24) =956017a(25) =1546868a(26) =2502885a(27) =4049753a(28) =6552638a(29) =10602391