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A219941 as a simple table

n a(n)
1 20
2 76
3 368
4 2070
5 8523
6 30558
7 100761
8 313108
9 921941
10 2585664
11 6949146
12 18004266
13 45195087
14 110356035
15 262913226
16 612588113
17 1398558018
18 3133356168
19 6897689403
20 14935630967
21 31839486936
22 66877133838
23 138505092333
24 283012794327

[20,76,368,2070,8523,30558,100761,313108,921941,
 2585664,6949146,18004266,45195087,110356035,
 262913226,612588113,1398558018,3133356168,
 6897689403,14935630967,31839486936,66877133838,
 138505092333,283012794327]

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Last modified May 17 16:12 EDT 2022. Contains 353747 sequences. (Running on oeis4.)