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A220106 as a simple table

n a(n)
1 4
2 16
3 56
4 250
5 984
6 3888
7 15798
8 63092
9 252064
10 1010554
11 4040556
12 16155482
13 64620946
14 258358476
15 1032891644
16 4129483594
17 16508060352
18 65991303276
19 263798841494
20 1054506124776
21 4215228829600
22 16849633947562
23 67352986553090

[4,16,56,250,984,3888,15798,63092,252064,1010554,
 4040556,16155482,64620946,258358476,1032891644,
 4129483594,16508060352,65991303276,263798841494,
 1054506124776,4215228829600,16849633947562,
 67352986553090]

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Last modified May 24 17:23 EDT 2022. Contains 354042 sequences. (Running on oeis4.)