A180910 - OEIS

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A180910 as a simple table

n	a(n)
1	1
2	6
3	50
4	444
5	4095
6	38532
7	367322
8	3533112
9	34204975
10	332775412
11	3249900751
12	31835316002
13	312622943953
14	3076226193598
15	30321954730777
16	299312070501364
17	2958208307116218
18	29268288065205160
19	289847587059195157

[1,6,50,444,4095,38532,367322,3533112,34204975, 332775412,3249900751,31835316002,312622943953, 3076226193598,30321954730777,299312070501364, 2958208307116218,29268288065205160, 289847587059195157]