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A053564 as a simple table

n a(n)
1 0
2 0
3 1
4 3
5 6
6 13
7 36
8 93
9 243
10 645
11 1782
12 4914
13 13608
14 37890
15 106288
16 299025
17 844182
18 2391363
19 6797196
20 19371684
21 55345784
22 158486625
23 454795398
24 1307541690
25 3765720066
26 10862647236
27 31381059609
28 90780960426
29 262951692390

[0,0,1,3,6,13,36,93,243,645,1782,4914,13608,37890,
 106288,299025,844182,2391363,6797196,19371684,
 55345784,158486625,454795398,1307541690,
 3765720066,10862647236,31381059609,90780960426,
 262951692390]

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Last modified September 28 05:33 EDT 2020. Contains 337392 sequences. (Running on oeis4.)