Fibonacci sequence with initial terms 10 and 21.

Terms

a(0) =10a(1) =21a(2) =31a(3) =52a(4) =83a(5) =135a(6) =218a(7) =353a(8) =571a(9) =924a(10) =1495a(11) =2419a(12) =3914a(13) =6333a(14) =10247a(15) =16580a(16) =26827a(17) =43407a(18) =70234a(19) =113641a(20) =183875a(21) =297516a(22) =481391a(23) =778907a(24) =1260298a(25) =2039205a(26) =3299503a(27) =5338708a(28) =8638211a(29) =13976919