A088181 - OEIS

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A088181 as a simple table

n	a(n)
0	1
1	2
2	8
3	49
4	400
5	4081
6	49964
7	713665
8	11649936
9	213946513
10	4365604372
11	97988751433
12	2399366732888
13	63647177397961
14	1818219651069852
15	55651486523443537
16	1816920458689600288
17	63026617425620098465

[1,2,8,49,400,4081,49964,713665,11649936, 213946513,4365604372,97988751433,2399366732888, 63647177397961,1818219651069852,55651486523443537, 1816920458689600288,63026617425620098465]