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A337249
as a simple table
n
a(n)
1
1
2
3
3
44
4
710
5
1420
6
2130
7
2840
8
312689
9
10838702
10
6167950454
11
21053343141
12
63160029423
13
105266715705
[1,3,44,710,1420,2130,2840,312689,10838702, 6167950454,21053343141,63160029423,105266715705]