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A071683 as a simple table

n a(n)
1 1
2 4
3 72
4 305
5 1292
6 5473
7 23184
8 98209
9 416020
10 1762289
11 7465176
12 31622993
13 133957148
14 567451585
15 2403763488
16 10182505537
17 43133785636
18 182717648081
19 774004377960
20 3278735159921
21 13888945017644
22 58834515230497

[1,4,72,305,1292,5473,23184,98209,416020,1762289,
 7465176,31622993,133957148,567451585,2403763488,
 10182505537,43133785636,182717648081,774004377960,
 3278735159921,13888945017644,58834515230497]

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Last modified October 21 11:42 EDT 2019. Contains 328296 sequences. (Running on oeis4.)