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A180068 as a simple table

n a(n)
2 2
3 2
4 6
5 16
6 34
7 140
8 508
9 2100
10 9386
11 44398
12 214410
13 1103178
14 6002116
15 33772692
16 196340714
17 1190396084
18 7486976948
19 48456599516
20 322526380686
21 2215295406072
22 15651462450174
23 113259396917170

[2,2,6,16,34,140,508,2100,9386,44398,214410,
 1103178,6002116,33772692,196340714,1190396084,
 7486976948,48456599516,322526380686,2215295406072,
 15651462450174,113259396917170]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)