A018067 - OEIS

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A018067 as a simple table

n	a(n)
0	1
1	2
2	3
3	5
4	8
5	13
6	23
7	38
8	64
9	108
10	181
11	304
12	512
13	861
14	1448
15	2435
16	4096
17	6889
18	11585
19	19484
20	32768
21	55109
22	92682
23	155872
24	262144
25	440872
26	741455
27	1246974
28	2097152
29	3526975
30	5931642
31	9975792
32	16777216

[1,2,3,5,8,13,23,38,64,108,181,304,512,861,1448, 2435,4096,6889,11585,19484,32768,55109,92682, 155872,262144,440872,741455,1246974,2097152, 3526975,5931642,9975792,16777216]