A127128 - OEIS

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A127128 as a simple table

n	a(n)
1	1
2	2
3	9
4	54
5	412
6	3834
7	42131
8	533558
9	7645065
10	122177706
11	2153221318
12	41464853266
13	865908079369
14	19484990264956
15	469910189792853
16	12089047867952058
17	330423404118495975
18	9561012695542004496

[1,2,9,54,412,3834,42131,533558,7645065,122177706, 2153221318,41464853266,865908079369, 19484990264956,469910189792853,12089047867952058, 330423404118495975,9561012695542004496]