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A211464 as a simple table

n a(n)
1 21
2 89
3 353
4 1373
5 5225
6 19645
7 73105
8 270125
9 992545
10 3631741
11 13245457
12 48187085
13 174966209
14 634348221
15 2297224145
16 8311862669
17 30054358337
18 108618731197
19 392419038993
20 1417394738125
21 5118764739265
22 18484320138301
23 66746754619345

[21,89,353,1373,5225,19645,73105,270125,992545,
 3631741,13245457,48187085,174966209,634348221,
 2297224145,8311862669,30054358337,108618731197,
 392419038993,1417394738125,5118764739265,
 18484320138301,66746754619345]

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Last modified May 27 12:49 EDT 2022. Contains 354097 sequences. (Running on oeis4.)