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A135264 as a simple table

n a(n)
0 3
1 12
2 42
3 123
4 366
5 1092
6 3279
7 9840
8 29526
9 88575
10 265722
11 797160
12 2391483
13 7174452
14 21523362
15 64570083
16 193710246
17 581130732
18 1743392199
19 5230176600
20 15690529806
21 47071589415
22 141214768242
23 423644304720
24 1270932914163

[3,12,42,123,366,1092,3279,9840,29526,88575,
 265722,797160,2391483,7174452,21523362,64570083,
 193710246,581130732,1743392199,5230176600,
 15690529806,47071589415,141214768242,423644304720,
 1270932914163]

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Last modified October 21 16:50 EDT 2019. Contains 328302 sequences. (Running on oeis4.)