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A137555 as a simple table

n a(n)
1 1
2 2
3 5
4 14
5 43
6 147
7 578
8 2702
9 15252
10 103150
11 817928
12 7428844
13 75807522
14 856512850
15 10596715538 

[1,2,5,14,43,147,578,2702,15252,103150,817928,
 7428844,75807522,856512850,10596715538]

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Last modified June 28 10:20 EDT 2022. Contains 354903 sequences. (Running on oeis4.)