A017065 - OEIS

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A017065 as a simple table

n	a(n)
0	1
1	18
2	235
3	2760
4	31141
5	345918
6	3819295
7	42071220
8	463025881
9	5094274218
10	56041033555
11	616467614880
12	6781209278221
13	74593565712918
14	820530282235015
15	9025837356505740
16	99284227972292161
17	1092126576027270018

[1,18,235,2760,31141,345918,3819295,42071220, 463025881,5094274218,56041033555,616467614880, 6781209278221,74593565712918,820530282235015, 9025837356505740,99284227972292161, 1092126576027270018]