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A126391 as a simple table

na(n)
11
21
34
424
5240
64320
7146880
89694080
91260230400
10325139443200
11167121673804800
12171466837323724800
13351507016513635840000
141440475753672879672320000
1511803258325595576034990080000

[1,1,4,24,240,4320,146880,9694080,1260230400,
 325139443200,167121673804800,171466837323724800,
 351507016513635840000,1440475753672879672320000,
 11803258325595576034990080000]