A144621 - OEIS

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A144621 as a simple table

n	a(n)
0	1
1	1
2	3
3	21
4	945
5	1845585
6	6922244887425
7	96595543392827888368850625
8	18734868077603955570406193129480504943860234712890625

[1,1,3,21,945,1845585,6922244887425, 96595543392827888368850625, 18734868077603955570406193129480504943860234712890\ 625]