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A111017 as a simple table

n a(n)
0 0
1 1
2 2
3 7
4 20
5 61
6 180
7 543
8 1622
9 4873
10 14598
11 43815
12 131384
13 394213
14 1182456
15 3547551
16 10642110
17 31926873
18 95778990
19 287338599
20 862010924
21 2586037645
22 7758098316
23 23274309567
24 69822884886
25 209468698473
26 628405963974

[0,1,2,7,20,61,180,543,1622,4873,14598,43815,
 131384,394213,1182456,3547551,10642110,31926873,
 95778990,287338599,862010924,2586037645,
 7758098316,23274309567,69822884886,209468698473,
 628405963974]

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Last modified April 22 09:30 EDT 2021. Contains 343174 sequences. (Running on oeis4.)