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A067222
as a simple table
n
a(n)
0
1
1
15
2
225
3
229503
4
42980713761
5
1380524064964529355
6
7955148565342992851131291305
[1,15,225,229503,42980713761,1380524064964529355, 7955148565342992851131291305]