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A000226 as a simple table

n a(n)
3 1
4 1
5 3
6 7
7 18
8 44
9 117
10 299
11 793
12 2095
13 5607
14 15047
15 40708
16 110499
17 301541
18 825784
19 2270211
20 6260800
21 17319689
22 48042494
23 133606943
24 372430476
25 1040426154
26 2912415527
27 8167992598
28 22947778342
29 64577555147
30 182009003773
31 513729375064
32 1452007713130

[1,1,3,7,18,44,117,299,793,2095,5607,15047,40708,
 110499,301541,825784,2270211,6260800,17319689,
 48042494,133606943,372430476,1040426154,
 2912415527,8167992598,22947778342,64577555147,
 182009003773,513729375064,1452007713130]

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