A153593 - OEIS

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A153593 as a simple table

n	a(n)
1	1
2	18
3	245
4	2988
5	34429
6	383670
7	4186169
8	45041112
9	480032665
10	5082340122
11	53559541661
12	562566880260
13	5895000053461
14	61667217421758
15	644304909368225
16	6725778192309168
17	70163919621475249
18	731614075994130210

[1,18,245,2988,34429,383670,4186169,45041112, 480032665,5082340122,53559541661,562566880260, 5895000053461,61667217421758,644304909368225, 6725778192309168,70163919621475249, 731614075994130210]