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A218837 as a simple table

n a(n)
1 4
2 20
3 93
4 436
5 2043
6 9573
7 44857
8 210190
9 984904
10 4615043
11 21625074
12 101330329
13 474811581
14 2224862385
15 10425214612
16 48850257184
17 228901534957
18 1072582125992
19 5025883366023
20 23550181377025
21 110350957732161
22 517080258425742

[4,20,93,436,2043,9573,44857,210190,984904,
 4615043,21625074,101330329,474811581,2224862385,
 10425214612,48850257184,228901534957,
 1072582125992,5025883366023,23550181377025,
 110350957732161,517080258425742]

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Last modified August 26 09:55 EDT 2024. Contains 375455 sequences. (Running on oeis4.)