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A168506 as a simple table

n a(n)
2 2
3 2
4 8
5 18
6 64
7 188
8 656
9 2154
10 7584
11 26276
12 93904
13 335156
14 1214944
15 4417848
16 16208672
17 59704858
18 221215552
19 822721108
20 3072787920
21 11514183900
22 43287544160
23 163193085960
24 616876440160
25 2337336770948
26 8875826681024

[2,2,8,18,64,188,656,2154,7584,26276,93904,335156,
 1214944,4417848,16208672,59704858,221215552,
 822721108,3072787920,11514183900,43287544160,
 163193085960,616876440160,2337336770948,
 8875826681024]

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)