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A056473 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 1
9 10
10 10
11 65
12 65
13 350
14 350
15 1701
16 1701
17 7770
18 7770
19 34105
20 34105
21 145750
22 145750
23 611501
24 611501
25 2532530
26 2532530
27 10391745
28 10391745
29 42355950
30 42355950
31 171798901

[0,0,0,0,0,0,1,1,10,10,65,65,350,350,1701,1701,
 7770,7770,34105,34105,145750,145750,611501,611501,
 2532530,2532530,10391745,10391745,42355950,
 42355950,171798901]

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Last modified March 29 15:16 EDT 2020. Contains 333107 sequences. (Running on oeis4.)