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A221249
as a simple table
n
a(n)
1
0
2
3025
3
441720
4
367565584
5
142283547000
6
71306050492681
7
31835526389622592
8
14864426276052147876
[0,3025,441720,367565584,142283547000, 71306050492681,31835526389622592, 14864426276052147876]