A155669 - OEIS

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A155669 as a simple table

n	a(n)
0	1
1	18
2	180
3	1728
4	16560
5	159048
6	1531440
7	14782968
8	143046720
9	1387420488
10	13486784400
11	131381059608
12	1282429536480
13	12541865828328
14	122876792454960
15	1205891132094648
16	11853020188851840
17	116677181699666568

[1,18,180,1728,16560,159048,1531440,14782968, 143046720,1387420488,13486784400,131381059608, 1282429536480,12541865828328,122876792454960, 1205891132094648,11853020188851840, 116677181699666568]