A058518 - OEIS

A058518 as a simple table

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	4
6	6
7	9
8	14
9	21
10	33
11	54
12	89
13	142
14	222
15	350
16	554
17	883
18	1406
19	2225
20	3511
21	5539
22	8768
23	13977
24	22417
25	36143
26	58483
27	94818
28	153716
29	248699
30	401054
31	644485
32	1032794
33	1652377
34	2642421
35	4227547
36	6769660
37	10851491
38	17410292
39	27951747

[1,1,1,2,2,4,6,9,14,21,33,54,89,142,222,350,554, 883,1406,2225,3511,5539,8768,13977,22417,36143, 58483,94818,153716,248699,401054,644485,1032794, 1652377,2642421,4227547,6769660,10851491,17410292, 27951747]