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A133228 as a simple table

n a(n)
1 0
2 0
3 1
4 2
5 4
6 9
7 19
8 46
9 110
10 291
11 822
12 2455
13 7740
14 25635
15 88849
16 320749
17 1202674
18 4670156
19 18741145
20 77553119
21 330321299
22 1445829174
23 6493985903
24 29891948760
25 140843699641
26 678576973614
27 3339785593878

[0,0,1,2,4,9,19,46,110,291,822,2455,7740,25635,
 88849,320749,1202674,4670156,18741145,77553119,
 330321299,1445829174,6493985903,29891948760,
 140843699641,678576973614,3339785593878]

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Last modified May 7 00:22 EDT 2021. Contains 343609 sequences. (Running on oeis4.)