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A278621 as a simple table

n a(n)
1 3
2 46
3 357
4 1952
5 8518
6 31605
7 103546
8 307087
9 838936
10 2138608
11 5137407
12 11719956
13 25549096
14 53493458
15 108027996
16 211167710
17 400765157
18 740380790
19 1334456849
20 2351234708
21 4056807390
22 6864961455
23 11409118950
24 18644841765
25 29994129570

[3,46,357,1952,8518,31605,103546,307087,838936,
 2138608,5137407,11719956,25549096,53493458,
 108027996,211167710,400765157,740380790,
 1334456849,2351234708,4056807390,6864961455,
 11409118950,18644841765,29994129570]

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Last modified October 25 06:30 EDT 2021. Contains 348239 sequences. (Running on oeis4.)