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A227732 as a simple table

na(n)
01
18
252
3288
41396
56208
625744
7100608
8374500
91336488
104596000
1115297056
1249444368
13155640640
14478268800
151437600000
164234216836
1712238666208
1834761065924
1997130259232
20267280386128
21724987680384
221940011007056
235125212451584
2413376644454672
2534512562565224

[1,8,52,288,1396,6208,25744,100608,374500,1336488,
 4596000,15297056,49444368,155640640,478268800,
 1437600000,4234216836,12238666208,34761065924,
 97130259232,267280386128,724987680384,
 1940011007056,5125212451584,13376644454672,
 34512562565224]