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A220971 as a simple table

n a(n)
1 2
2 2
3 9
4 23
5 58
6 149
7 379
8 969
9 2472
10 6304
11 16057
12 40876
13 104003
14 264525
15 672599
16 1709802
17 4345654
18 11043371
19 28060714
20 71294653
21 181127587
22 460138081
23 1168887760
24 2969221064
25 7542242881
26 19157959588
27 48662085275
28 123602270581

[2,2,9,23,58,149,379,969,2472,6304,16057,40876,
 104003,264525,672599,1709802,4345654,11043371,
 28060714,71294653,181127587,460138081,1168887760,
 2969221064,7542242881,19157959588,48662085275,
 123602270581]

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Last modified October 26 02:14 EDT 2021. Contains 348256 sequences. (Running on oeis4.)