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A267662 as a simple table

n a(n)
1 3
2 18
3 108
4 453
5 1800
6 6654
7 23967
8 84552
9 295176
10 1023321
11 3533484
12 12170886
13 41859891
14 143844024
15 494032074
16 1696231551
17 5822855280
18 19986766938
19 68599945065
20 235446171408
21 808076493654
22 2773384864119
23 9518456958738

[3,18,108,453,1800,6654,23967,84552,295176,
 1023321,3533484,12170886,41859891,143844024,
 494032074,1696231551,5822855280,19986766938,
 68599945065,235446171408,808076493654,
 2773384864119,9518456958738]

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Last modified April 16 01:01 EDT 2024. Contains 371696 sequences. (Running on oeis4.)