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A230648 as a simple table

n a(n)
1 0
2 9
3 21
4 123
5 531
6 2547
7 11745
8 54957
9 255753
10 1192623
11 5557191
12 25901847
13 120714693
14 562609041
15 2622085629
16 12220512675
17 56954899323
18 265444104699
19 1237128910377
20 5765764156725
21 26871924749169
22 125239314486231

[0,9,21,123,531,2547,11745,54957,255753,1192623,
 5557191,25901847,120714693,562609041,2622085629,
 12220512675,56954899323,265444104699,
 1237128910377,5765764156725,26871924749169,
 125239314486231]

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Last modified August 8 02:48 EDT 2024. Contains 375018 sequences. (Running on oeis4.)