A164969 - OEIS

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A164969 as a simple table

n	a(n)
0	1
1	27
2	702
3	18252
4	474552
5	12338352
6	320797152
7	8340725952
8	216858874401
9	5638330725300
10	146596598620875
11	3811511557982700
12	99099300347388900
13	2576581804867917600
14	66991126818296818800
15	1741769294460722280000

[1,27,702,18252,474552,12338352,320797152, 8340725952,216858874401,5638330725300, 146596598620875,3811511557982700, 99099300347388900,2576581804867917600, 66991126818296818800,1741769294460722280000]