A206720 - OEIS

A206720 as a simple table

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	5
7	8
8	13
9	23
10	38
11	63
12	105
13	178
14	300
15	501
16	849
17	1431
18	2405
19	4044
20	6812
21	11491
22	19361
23	32621
24	54946
25	92646
26	156118
27	262964
28	443200
29	746933
30	1258840
31	2121343
32	3575153
33	6025323
34	10154336
35	17112673
36	28839762
37	48605300
38	81913614
39	138049346
40	232655873

[1,1,1,2,3,5,8,13,23,38,63,105,178,300,501,849, 1431,2405,4044,6812,11491,19361,32621,54946,92646, 156118,262964,443200,746933,1258840,2121343, 3575153,6025323,10154336,17112673,28839762, 48605300,81913614,138049346,232655873]