A018153 - OEIS

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A018153 as a simple table

n	a(n)
0	1
1	1
2	2
3	4
4	8
5	14
6	23
7	40
8	68
9	115
10	196
11	332
12	563
13	954
14	1618
15	2744
16	4651
17	7885
18	13367
19	22661
20	38416
21	65123
22	110398
23	187149
24	317259
25	537824
26	911729
27	1545579
28	2620094
29	4441632
30	7529536
31	12764206
32	21638115

[1,1,2,4,8,14,23,40,68,115,196,332,563,954,1618, 2744,4651,7885,13367,22661,38416,65123,110398, 187149,317259,537824,911729,1545579,2620094, 4441632,7529536,12764206,21638115]