A048356 - OEIS

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A048356 as a simple table

n	a(n)
1	1
2	18
3	58
4	458
5	1541
6	6018
7	47141
8	149406
9	471404
10	4756366
11	15563541
12	149075893
13	149004101
14	149071198
15	14907133333
16	47322533981
17	471406654834
18	1510636363333

[1,18,58,458,1541,6018,47141,149406,471404, 4756366,15563541,149075893,149004101,149071198, 14907133333,47322533981,471406654834, 1510636363333]