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A269023 as a simple table

n a(n)
1 2
2 4
3 8
4 19
5 51
6 141
7 392
8 1079
9 2957
10 8072
11 21987
12 59825
13 162695
14 442342
15 1202521
16 3268920
17 8885999
18 24154826
19 65659826
20 178482140

[2,4,8,19,51,141,392,1079,2957,8072,21987,59825,
 162695,442342,1202521,3268920,8885999,24154826,
 65659826,178482140]

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Last modified May 29 03:06 EDT 2020. Contains 334696 sequences. (Running on oeis4.)