A144684 - OEIS

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A144684 as a simple table

n	a(n)
0	1
1	1
2	9
3	265
4	15281
5	1379441
6	173762425
7	28528990393
8	5838405067745
9	1443332192692321
10	421171717332106601
11	142520112730201819625
12	55149333235223148407953
13	24128837930726025305020369

[1,1,9,265,15281,1379441,173762425,28528990393, 5838405067745,1443332192692321,421171717332106601, 142520112730201819625,55149333235223148407953, 24128837930726025305020369]