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A027174 as a simple table

n a(n)
2 9
3 58
4 264
5 1106
6 4495
7 18014
8 71652
9 283760
10 1120806
11 4419928
12 17413572
13 68569666
14 269941451
15 1062631046
16 4183370636
17 16471711736
18 64870158866
19 255541666976
20 1006930883396
21 3968854010936
22 15648092510618
23 61714841143568

[9,58,264,1106,4495,18014,71652,283760,1120806,
 4419928,17413572,68569666,269941451,1062631046,
 4183370636,16471711736,64870158866,255541666976,
 1006930883396,3968854010936,15648092510618,
 61714841143568]

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Last modified August 16 07:50 EDT 2022. Contains 356160 sequences. (Running on oeis4.)