>> a=sym(1:2);
>> for k=3:100,a(k)=a(k-1)+a(k-2);
end,a(end)
ans =
573147844013817084101
>> a
a =
[ 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711,
28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578,
5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141,
267914296, 433494437, 701408733, 1134903170, 1836311903, 2971215073, 4807526976,
7778742049, 12586269025, 20365011074, 32951280099, 53316291173, 86267571272,
139583862445, 225851433717, 365435296162, 591286729879, 956722026041, 1548008755920,
2504730781961, 4052739537881, 6557470319842, 10610209857723, 17167680177565,
27777890035288, 44945570212853, 72723460248141, 117669030460994, 190392490709135,
308061521170129, 498454011879264, 806515533049393, 1304969544928657,
2111485077978050, 3416454622906707, 5527939700884757, 8944394323791464,
14472334024676221, 23416728348467685, 37889062373143906, 61305790721611591,
99194853094755497, 160500643816367088, 259695496911122585, 420196140727489673,
679891637638612258, 1100087778366101931, 1779979416004714189, 2880067194370816120,
4660046610375530309, 7540113804746346429, 12200160415121876738,
19740274219868223167, 31940434634990099905, 51680708854858323072,
83621143489848422977, 135301852344706746049, 218922995834555169026,
354224848179261915075, 573147844013817084101]
>>