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A173391 as a simple table

n a(n)
1 9
2 21
3 45
4 105
5 273
6 765
7 2229
8 6609
9 19737
10 59109
11 177213
12 531513
13 1594401
14 4783053
15 14348997
16 43046817
17 129140265
18 387420597
19 1162261581
20 3486784521
21 10460353329
22 31381059741
23 94143178965
24 282429536625
25 847288609593

[9,21,45,105,273,765,2229,6609,19737,59109,177213,
 531513,1594401,4783053,14348997,43046817,
 129140265,387420597,1162261581,3486784521,
 10460353329,31381059741,94143178965,282429536625,
 847288609593]

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Last modified October 24 16:24 EDT 2021. Contains 348233 sequences. (Running on oeis4.)