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A001394 as a simple table

n a(n)
0 1
1 4
2 12
3 36
4 108
5 324
6 948
7 2796
8 8196
9 24060
10 70188
11 205284
12 597996
13 1744548
14 5073900
15 14774652
16 42922452
17 124814484
18 362267652
19 1052271732
20 3051900516
21 8857050204
22 25671988020
23 74449697484
24 215677847460
25 625096195404
26 1810062340812
27 5243388472212

[1,4,12,36,108,324,948,2796,8196,24060,70188,
 205284,597996,1744548,5073900,14774652,42922452,
 124814484,362267652,1052271732,3051900516,
 8857050204,25671988020,74449697484,215677847460,
 625096195404,1810062340812,5243388472212]

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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)