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A006682 as a simple table

n a(n)
2 1
3 4
4 20
5 155
6 1716
7 24654
8 434155
9 9043990
10 217457456
11 5926620029
12 180538177590
13 6078622845750
14 224156328707221
15 8984765008810504
16 388939866084222200
17 18083736252080051435
18 898779656769444326136
19 47551736771345760732954

[1,4,20,155,1716,24654,434155,9043990,217457456,
 5926620029,180538177590,6078622845750,
 224156328707221,8984765008810504,
 388939866084222200,18083736252080051435,
 898779656769444326136,47551736771345760732954]

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Last modified April 19 05:19 EDT 2024. Contains 371782 sequences. (Running on oeis4.)