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A123109 as a simple table

n a(n)
0 1
1 3
2 12
3 39
4 120
5 363
6 1092
7 3279
8 9840
9 29523
10 88572
11 265719
12 797160
13 2391483
14 7174452
15 21523359
16 64570080
17 193710243
18 581130732
19 1743392199
20 5230176600
21 15690529803
22 47071589412
23 141214768239
24 423644304720
25 1270932914163

[1,3,12,39,120,363,1092,3279,9840,29523,88572,
 265719,797160,2391483,7174452,21523359,64570080,
 193710243,581130732,1743392199,5230176600,
 15690529803,47071589412,141214768239,423644304720,
 1270932914163]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)