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A263852 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 21
5 87
6 413
7 2213
8 13205
9 86828
10 623712
11 4859307
12 40810353
13 367525528
14 3532986232
15 36107260781
16 390938180027
17 4470065574970
18 53825174198772
19 680796406765054
20 9024180239004754
21 125096535241364056
22 1810074349321324370
23 27289548352480937756

[1,1,2,6,21,87,413,2213,13205,86828,623712,
 4859307,40810353,367525528,3532986232,36107260781,
 390938180027,4470065574970,53825174198772,
 680796406765054,9024180239004754,
 125096535241364056,1810074349321324370,
 27289548352480937756]

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Last modified July 18 19:00 EDT 2019. Contains 325144 sequences. (Running on oeis4.)