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A018181 as a simple table

n a(n)
0 1
1 2
2 4
3 7
4 12
5 23
6 43
7 81
8 151
9 283
10 529
11 990
12 1854
13 3471
14 6499
15 12167
16 22779
17 42646
18 79840
19 149474
20 279841
21 523910
22 980850
23 1836319
24 3437903
25 6436343
26 12049936
27 22559544
28 42235329
29 79071768
30 148035889

[1,2,4,7,12,23,43,81,151,283,529,990,1854,3471,
 6499,12167,22779,42646,79840,149474,279841,523910,
 980850,1836319,3437903,6436343,12049936,22559544,
 42235329,79071768,148035889]

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Last modified January 23 21:56 EST 2022. Contains 350515 sequences. (Running on oeis4.)