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A059020 as a simple table

n a(n)
0 0
1 3
2 13
3 40
4 108
5 275
6 681
7 1664
8 4040
9 9779
10 23637
11 57096
12 137876
13 332899
14 803729
15 1940416
16 4684624
17 11309731
18 27304157
19 65918120
20 159140476
21 384199155
22 927538873
23 2239276992
24 5406092952
25 13051462995
26 31509019045
27 76069501192

[0,3,13,40,108,275,681,1664,4040,9779,23637,57096,
 137876,332899,803729,1940416,4684624,11309731,
 27304157,65918120,159140476,384199155,927538873,
 2239276992,5406092952,13051462995,31509019045,
 76069501192]

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Last modified September 20 10:44 EDT 2019. Contains 327229 sequences. (Running on oeis4.)