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A023021 as a simple table

n a(n)
0 1
1 23
2 299
3 2852
4 22126
5 147407
6 871838
7 4680845
8 23177583
9 107100903
10 466066181
11 1923780950
12 7576060505
13 28601630657
14 103928814438
15 364712523658
16 1239637963457
17 4091266414235
18 13139808783725
19 41145568478988
20 125833948024603
21 376417734772625
22 1102878148698235

[1,23,299,2852,22126,147407,871838,4680845,
 23177583,107100903,466066181,1923780950,
 7576060505,28601630657,103928814438,364712523658,
 1239637963457,4091266414235,13139808783725,
 41145568478988,125833948024603,376417734772625,
 1102878148698235]

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Last modified October 14 18:28 EDT 2019. Contains 328022 sequences. (Running on oeis4.)