A084729 - OEIS

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A084729 as a simple table

n	a(n)
1	2
2	3
3	7
4	73
5	1801
6	21601
7	151201
8	8467201
9	304819201
10	18289152001
11	201180672001
12	4828336128001
13	502146957312001
14	56240459218944001
15	12654103324262400001
16	1417259572317388800001
17	144560476376373657600001

[2,3,7,73,1801,21601,151201,8467201,304819201, 18289152001,201180672001,4828336128001, 502146957312001,56240459218944001, 12654103324262400001,1417259572317388800001, 144560476376373657600001]