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A115506 as a simple table

na(n)
11
22
36
48
524
6168
7840
81008
94032
1032160
11192960
121297440
139082080
14126846720
151141620480
161243468800
174490307360
1853812332000
19526257365760
203736568586240
2133629117276160
22539852417395200
235938376591347200
2443328496719692800
25612865454506905600
2612864962752408166400
27204270526971128217600
282666714307922074009600
2940000714618831110144000

[1,2,6,8,24,168,840,1008,4032,32160,192960,
 1297440,9082080,126846720,1141620480,1243468800,
 4490307360,53812332000,526257365760,3736568586240,
 33629117276160,539852417395200,5938376591347200,
 43328496719692800,612865454506905600,
 12864962752408166400,204270526971128217600,
 2666714307922074009600,40000714618831110144000]