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A018083 as a simple table

n a(n)
0 1
1 2
2 4
3 7
4 13
5 25
6 47
7 90
8 169
9 321
10 610
11 1158
12 2197
13 4172
14 7922
15 15042
16 28561
17 54233
18 102979
19 195538
20 371293
21 705022
22 1338716
23 2541993
24 4826809
25 9165285
26 17403308
27 33045904
28 62748517
29 119148699
30 226242996

[1,2,4,7,13,25,47,90,169,321,610,1158,2197,4172,
 7922,15042,28561,54233,102979,195538,371293,
 705022,1338716,2541993,4826809,9165285,17403308,
 33045904,62748517,119148699,226242996]

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Last modified July 26 20:34 EDT 2021. Contains 346295 sequences. (Running on oeis4.)