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A075088 as a simple table

na(n)
01
13
26
328
436
5120
6528
72080
82016
925200
1032640
11819840
12131328
137874496
1420476800
1552433920
168386560
17102767616
18536887296
192147450880
2026306560000
2116240435200
22116802736128
2334359607296
242199022206976
25549755289600

[1,3,6,28,36,120,528,2080,2016,25200,32640,819840,
 131328,7874496,20476800,52433920,8386560,
 102767616,536887296,2147450880,26306560000,
 16240435200,116802736128,34359607296,
 2199022206976,549755289600]