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A051922
as a simple table
n
a(n)
0
1
1
12
2
63
3
224
4
630
5
1512
6
3234
7
6336
8
11583
9
20020
10
33033
11
52416
12
80444
[1,12,63,224,630,1512,3234,6336,11583,20020,33033, 52416,80444]