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A197404 as a simple table

n a(n)
1 4
2 20
3 60
4 358
5 1626
6 7232
7 34717
8 160988
9 748843
10 3514426
11 16448990
12 76889286
13 359867470
14 1684122959
15 7879951514
16 36879246800
17 172597946528
18 807735845097
19 3780221117751
20 17691605965676
21 82797291928191
22 387496301051514

[4,20,60,358,1626,7232,34717,160988,748843,
 3514426,16448990,76889286,359867470,1684122959,
 7879951514,36879246800,172597946528,807735845097,
 3780221117751,17691605965676,82797291928191,
 387496301051514]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)