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A060919 as a simple table

n a(n)
1 4
2 8
3 20
4 60
5 204
6 748
7 2860
8 11180
9 44204
10 175788
11 701100
12 2800300
13 11193004
14 44755628
15 178989740
16 715893420
17 2863442604
18 11453508268
19 45813508780
20 183252986540
21 733009849004
22 2932035201708
23 11728132418220
24 46912512895660

[4,8,20,60,204,748,2860,11180,44204,175788,701100,
 2800300,11193004,44755628,178989740,715893420,
 2863442604,11453508268,45813508780,183252986540,
 733009849004,2932035201708,11728132418220,
 46912512895660]

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Last modified November 23 16:18 EST 2020. Contains 338590 sequences. (Running on oeis4.)