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A067771 as a simple table

n a(n)
0 3
1 6
2 15
3 42
4 123
5 366
6 1095
7 3282
8 9843
9 29526
10 88575
11 265722
12 797163
13 2391486
14 7174455
15 21523362
16 64570083
17 193710246
18 581130735
19 1743392202
20 5230176603
21 15690529806
22 47071589415
23 141214768242
24 423644304723
25 1270932914166

[3,6,15,42,123,366,1095,3282,9843,29526,88575,
 265722,797163,2391486,7174455,21523362,64570083,
 193710246,581130735,1743392202,5230176603,
 15690529806,47071589415,141214768242,423644304723,
 1270932914166]

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Last modified April 19 18:00 EDT 2024. Contains 371797 sequences. (Running on oeis4.)