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A181964 as a simple table

na(n)
11
21
36
436
5240
62160
720160
8241920
92903040
1039916800
11578793600
129580032000
13161902540800
143007651046400
1558845346560000
161234444603392000
1726854400821248000
18624231436308480000
1915083992450695168000
20385614968295997440000

[1,1,6,36,240,2160,20160,241920,2903040,39916800,
 578793600,9580032000,161902540800,3007651046400,
 58845346560000,1234444603392000,26854400821248000,
 624231436308480000,15083992450695168000,
 385614968295997440000]