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A238722 as a simple table

n a(n)
1 4
2 16
3 86
4 284
5 1506
6 4636
7 24298
8 73300
9 381280
10 1144292
11 5923512
12 17767180
13 91688754
14 275195668
15 1417323260
16 4257556764
17 21898760846
18 65830136636
19 338306366754
20 1017543445164
21 5226264297018
22 15725498143268
23 80738182410936

[4,16,86,284,1506,4636,24298,73300,381280,1144292,
 5923512,17767180,91688754,275195668,1417323260,
 4257556764,21898760846,65830136636,338306366754,
 1017543445164,5226264297018,15725498143268,
 80738182410936]

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Last modified October 3 18:24 EDT 2022. Contains 357237 sequences. (Running on oeis4.)