A204210 - OEIS

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A204210 as a simple table

n	a(n)
1	1
2	6
3	36
4	271
5	2181
6	18583
7	164255
8	1493142
9	13868334
10	131040555
11	1255641305
12	12172468671
13	119167633383
14	1176491130191
15	11699794149335
16	117092364762013
17	1178452895921961
18	11919463485729722
19	121096865173987004

[1,6,36,271,2181,18583,164255,1493142,13868334, 131040555,1255641305,12172468671,119167633383, 1176491130191,11699794149335,117092364762013, 1178452895921961,11919463485729722, 121096865173987004]