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A261317 as a simple table

n a(n)
0 1
1 0
2 1
3 2
4 3
5 20
6 175
7 210
8 4585
9 24920
10 101745
11 1266650
12 13562395
13 48588540
14 1082015935
15 9135376250
16 63098660625
17 1069777108400
18 13628391601825
19 88520971388850
20 2134604966569075
21 23945393042070500
22 236084869688242575
23 4893567386193135650
24 72576130763294383225

[1,0,1,2,3,20,175,210,4585,24920,101745,1266650,
 13562395,48588540,1082015935,9135376250,
 63098660625,1069777108400,13628391601825,
 88520971388850,2134604966569075,23945393042070500,
 236084869688242575,4893567386193135650,
 72576130763294383225]

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Last modified April 9 04:05 EDT 2020. Contains 333343 sequences. (Running on oeis4.)