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A277740
as a simple table
n
a(n)
0
1
1
2
2
6
3
36
4
276
5
2936
6
35872
7
484088
8
6967942
9
105555336
10
1664142836
[1,2,6,36,276,2936,35872,484088,6967942,105555336, 1664142836]