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A068548 as a simple table

na(n)
11
232
3400
43584
526880
6180224
71118208
86553600
936765696
10199229440
111049624576
125402263552
1327262976000
14135291469824
15661693399040
163195455668224
1715260018802688
1872155450572800
19338168545017856

[1,32,400,3584,26880,180224,1118208,6553600,
 36765696,199229440,1049624576,5402263552,
 27262976000,135291469824,661693399040,
 3195455668224,15260018802688,72155450572800,
 338168545017856]