A053535 - OEIS

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A053535 as a simple table

n	a(n)
0	1
1	6
2	63
3	540
4	4941
5	44226
6	398763
7	3586680
8	32286681
9	290560446
10	2615103063
11	23535750420
12	211822285221
13	1906398972666
14	17157595536963
15	154418345483760
16	1389765152400561
17	12507886242464886
18	112570976569604463

[1,6,63,540,4941,44226,398763,3586680,32286681, 290560446,2615103063,23535750420,211822285221, 1906398972666,17157595536963,154418345483760, 1389765152400561,12507886242464886, 112570976569604463]