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A000840 as a simple table

n a(n)
1 0
2 0
3 1
4 1
5 2
6 5
7 12
8 31
9 90
10 285
11 938
12 3285
13 11983
14 45390
15 177803
16 718390
17 2986407
18 12749364
19 55802982
20 250068732
21 1145923828
22 5363795830
23 25620207380
24 124767647097
25 618983876918
26 3126035142910
27 16060182735947
28 83883575376862
29 445164927249466
30 2399098651337048

[0,0,1,1,2,5,12,31,90,285,938,3285,11983,45390,
 177803,718390,2986407,12749364,55802982,250068732,
 1145923828,5363795830,25620207380,124767647097,
 618983876918,3126035142910,16060182735947,
 83883575376862,445164927249466,2399098651337048]

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Last modified April 23 09:49 EDT 2021. Contains 343204 sequences. (Running on oeis4.)