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A193484
as a simple table
n
a(n)
1
0
2
4
3
24
4
989
5
93061
6
31790896
7
29561132743
8
83415272837037
9
713619852188928603
[0,4,24,989,93061,31790896,29561132743, 83415272837037,713619852188928603]