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A261125
as a simple table
n
a(n)
0
1
1
1
2
2
3
48
4
1935360
5
40493130637639680000
6
10654991354747516157752604498631700563938508800000000000
[1,1,2,48,1935360,40493130637639680000, 10654991354747516157752604498631700563938508800000\ 000000]