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A153940 as a simple table

n a(n)
0 1
1 2
2 2
3 3
4 7
5 12
6 23
7 97
8 172
9 639
10 2729
11 9135
12 35231
13 283089
14 990826
15 7193827
16 60573511
17 397978987
18 3029188158
19 47855760575
20 329376229908
21 4705117486982
22 77869569220480
23 1005969603691107
24 15055192931186105
25 467694688000143716

[1,2,2,3,7,12,23,97,172,639,2729,9135,35231,
 283089,990826,7193827,60573511,397978987,
 3029188158,47855760575,329376229908,4705117486982,
 77869569220480,1005969603691107,15055192931186105,
 467694688000143716]

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Last modified April 11 18:59 EDT 2021. Contains 342888 sequences. (Running on oeis4.)