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A234958
as a simple table
n
a(n)
1
0
2
4
3
19
4
103
5
422
6
1559
7
5645
8
19329
9
64040
10
207637
11
663845
12
2103055
[0,4,19,103,422,1559,5645,19329,64040,207637, 663845,2103055]