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A026640 as a simple table

n a(n)
2 1
3 8
4 38
5 161
6 662
7 2672
8 10676
9 42398
10 167756
11 662252
12 2610758
13 10283861
14 40490702
15 159394424
16 627456188
17 2470223186
18 9726696572
19 38308366784
20 150916209308
21 594704861546
22 2344206594332
23 9243186573248
24 36456892635848

[1,8,38,161,662,2672,10676,42398,167756,662252,
 2610758,10283861,40490702,159394424,627456188,
 2470223186,9726696572,38308366784,150916209308,
 594704861546,2344206594332,9243186573248,
 36456892635848]

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Last modified June 29 21:48 EDT 2022. Contains 354913 sequences. (Running on oeis4.)