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A056280 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 10
6 65
7 350
8 1700
9 7770
10 34095
11 145750
12 611435
13 2532530
14 10391395
15 42355940
16 171797200
17 694337290
18 2798799150
19 11259666950
20 45232081795
21 181509069700
22 727778478075
23 2916342574750
24 11681056021300

[0,0,0,1,10,65,350,1700,7770,34095,145750,611435,
 2532530,10391395,42355940,171797200,694337290,
 2798799150,11259666950,45232081795,181509069700,
 727778478075,2916342574750,11681056021300]

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Last modified September 27 13:13 EDT 2020. Contains 337380 sequences. (Running on oeis4.)