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A063000
as a simple table
n
a(n)
0
3
1
15
2
75
3
322
4
1184
5
3814
6
10918
7
27772
8
61734
9
116966
10
183256
11
228016
12
211502
13
128994
14
37948
[3,15,75,322,1184,3814,10918,27772,61734,116966, 183256,228016,211502,128994,37948]