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A005954
as a simple table
n
a(n)
0
1
1
500
2
7220
3
36800
4
118580
5
288424
6
589760
7
1104000
8
1884980
9
2994740
10
4618024
[1,500,7220,36800,118580,288424,589760,1104000, 1884980,2994740,4618024]