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A005656 as a simple table

n a(n)
1 0
2 0
3 1
4 3
5 12
6 44
7 170
8 651
9 2520
10 9752
11 37854
12 147070
13 572264
14 2229096
15 8692788
16 33933459
17 132594480
18 518584880
19 2029976630
20 7952706234
21 31179618184
22 122331419080
23 480283635468
24 1886828198398

[0,0,1,3,12,44,170,651,2520,9752,37854,147070,
 572264,2229096,8692788,33933459,132594480,
 518584880,2029976630,7952706234,31179618184,
 122331419080,480283635468,1886828198398]

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Last modified June 14 13:42 EDT 2021. Contains 345025 sequences. (Running on oeis4.)