A017916 - OEIS

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A017916 as a simple table

n	a(n)
0	1
1	18
2	229
3	2562
4	27061
5	278058
6	2818549
7	28377522
8	284741941
9	2852272698
10	28547052469
11	285592329282
12	2856532847221
13	28568377838538
14	285699029999989
15	2857066572421842
16	28571047129374901
17	285712378448671578

[1,18,229,2562,27061,278058,2818549,28377522, 284741941,2852272698,28547052469,285592329282, 2856532847221,28568377838538,285699029999989, 2857066572421842,28571047129374901, 285712378448671578]