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A222867 as a simple table

n a(n)
1 1
2 2
3 3
4 7
5 20
6 67
7 254
8 1057
9 4700
10 21847
11 104474
12 508477
13 2501480
14 12386227
15 61570694
16 306778297
17 1530678260
18 7643776207
19 38190084914
20 190864134517
21 954061999040
22 4769534367787
23 23845345743134
24 119219752001137

[1,2,3,7,20,67,254,1057,4700,21847,104474,508477,
 2501480,12386227,61570694,306778297,1530678260,
 7643776207,38190084914,190864134517,954061999040,
 4769534367787,23845345743134,119219752001137]

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Last modified February 27 19:09 EST 2024. Contains 370378 sequences. (Running on oeis4.)