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A360865
as a simple table
n
a(n)
1
0
2
1
3
3
4
6
5
16
6
48
7
130
8
403
9
1293
10
4346
11
15318
12
56604
13
217802
14
873022
[0,1,3,6,16,48,130,403,1293,4346,15318,56604, 217802,873022]