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A222772 as a simple table

n a(n)
1 0
2 20
3 96
4 465
5 2608
6 15077
7 89811
8 544302
9 3349328
10 20823047
11 130535918
12 823585242
13 5221057054
14 33231082276
15 212180118775
16 1358528423728
17 8718262087314
18 56062919553225
19 361148981248207
20 2330144611056838

[0,20,96,465,2608,15077,89811,544302,3349328,
 20823047,130535918,823585242,5221057054,
 33231082276,212180118775,1358528423728,
 8718262087314,56062919553225,361148981248207,
 2330144611056838]

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Last modified August 19 22:40 EDT 2022. Contains 356231 sequences. (Running on oeis4.)