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A018089 as a simple table

n a(n)
0 1
1 2
2 4
3 8
4 15
5 30
6 59
7 115
8 225
9 443
10 872
11 1715
12 3375
13 6642
14 13072
15 25725
16 50625
17 99630
18 196070
19 385864
20 759375
21 1494443
22 2941047
23 5787950
24 11390625
25 22416633
26 44115701
27 86819244
28 170859375

[1,2,4,8,15,30,59,115,225,443,872,1715,3375,6642,
 13072,25725,50625,99630,196070,385864,759375,
 1494443,2941047,5787950,11390625,22416633,
 44115701,86819244,170859375]

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Last modified October 23 08:40 EDT 2021. Contains 348211 sequences. (Running on oeis4.)