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A247210
as a simple table
n
a(n)
0
0
1
0
2
1
3
4
4
14
5
47
6
154
7
514
8
1719
9
5901
10
20339
11
70137
12
245473
13
854033
14
3012779
15
10708332
[0,0,1,4,14,47,154,514,1719,5901,20339,70137, 245473,854033,3012779,10708332]