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A228415
as a simple table
n
a(n)
0
1
1
7
2
54
3
534
4
4909
5
45405
6
385008
7
3539880
8
32260781
9
294001190
10
2564080248
11
23271246324
12
211753431947
[1,7,54,534,4909,45405,385008,3539880,32260781, 294001190,2564080248,23271246324,211753431947]