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A022020 as a simple table

n a(n)
0 3
1 9
2 28
3 88
4 277
5 872
6 2746
7 8648
8 27236
9 85778
10 270153
11 850832
12 2679649
13 8439409
14 26579461
15 83710572
16 263641910
17 830325909
18 2615066456
19 8236010096
20 25938867499
21 81693057596
22 257287858063
23 810314166891
24 2552040558803
25 8037513448351
26 25313713063685
27 79724167578475

[3,9,28,88,277,872,2746,8648,27236,85778,270153,
 850832,2679649,8439409,26579461,83710572,
 263641910,830325909,2615066456,8236010096,
 25938867499,81693057596,257287858063,810314166891,
 2552040558803,8037513448351,25313713063685,
 79724167578475]

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Last modified September 18 20:10 EDT 2021. Contains 347534 sequences. (Running on oeis4.)