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A243247
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
10
6
78
7
755
8
10709
9
259123
10
11703831
11
1006591916
12
164058548700
13
50335887082115
[0,0,0,0,10,78,755,10709,259123,11703831, 1006591916,164058548700,50335887082115]