A170507 - OEIS

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A170507 as a simple table

n	a(n)
0	1
1	18
2	306
3	5202
4	88434
5	1503378
6	25557426
7	434476242
8	7386096114
9	125563633938
10	2134581776946
11	36287890208082
12	616894133537394
13	10487200270135698
14	178282404592306866
15	3030800878069216722
16	51523614927176684274

[1,18,306,5202,88434,1503378,25557426,434476242, 7386096114,125563633938,2134581776946, 36287890208082,616894133537394,10487200270135698, 178282404592306866,3030800878069216722, 51523614927176684274]