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A226917 as a simple table

n a(n)
2 1
3 4
4 9
5 25
6 58
7 142
8 324
9 748
10 1672
11 3736
12 8208
13 17968
14 38944
15 84064
16 180288
17 385216
18 819328 

[1,4,9,25,58,142,324,748,1672,3736,8208,17968,
 38944,84064,180288,385216,819328]

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Last modified May 10 11:13 EDT 2024. Contains 372387 sequences. (Running on oeis4.)