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A018886 as a simple table

n a(n)
1 1
2 7
3 23
4 79
5 223
6 703
7 2175
8 6399
9 19455
10 58367
11 176127
12 528383
13 1589247
14 4767743
15 14319615
16 42991615
17 129105919
18 387186687
19 1161822207
20 3486515199
21 10458497023
22 31377588223
23 94136958975
24 282427654143
25 847282962431
26 2541815332863

[1,7,23,79,223,703,2175,6399,19455,58367,176127,
 528383,1589247,4767743,14319615,42991615,
 129105919,387186687,1161822207,3486515199,
 10458497023,31377588223,94136958975,282427654143,
 847282962431,2541815332863]

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Last modified April 14 18:16 EDT 2021. Contains 342951 sequences. (Running on oeis4.)