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A031148 as a simple table

n a(n)
1 2
2 1
3 2
4 5
5 14
6 43
7 138
8 455
9 1540
10 5305
11 18546
12 65616
13 234546
14 845683
15 3072350
16 11235393
17 41326470
18 152793376
19 567518950
20 2116666670
21 7924062430
22 29765741831
23 112157686170
24 423809991041
25 1605622028100

[2,1,2,5,14,43,138,455,1540,5305,18546,65616,
 234546,845683,3072350,11235393,41326470,152793376,
 567518950,2116666670,7924062430,29765741831,
 112157686170,423809991041,1605622028100]

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)