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A211960
as a simple table
n
a(n)
1
0
2
0
3
65
4
3146
5
64705
6
695587
7
4904333
8
25825865
9
109813056
10
396433235
11
1257315972
12
3589635788
13
9392825390
[0,0,65,3146,64705,695587,4904333,25825865, 109813056,396433235,1257315972,3589635788, 9392825390]