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A118491 as a simple table

na(n)
01
12
26
330
4210
52310
630030
7510510
89699690
9223092870
106469693230
11200560490130
127420738134810
13304250263527210
1414299762385778870
15757887406446280110
1644715356980330526490
172995928917682145274830

[1,2,6,30,210,2310,30030,510510,9699690,223092870,
 6469693230,200560490130,7420738134810,
 304250263527210,14299762385778870,
 757887406446280110,44715356980330526490,
 2995928917682145274830]