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A308665 as a simple table

na(n)
31
42
54
648
7384
82304
94608
1018432
11552960
1219906560
13796262400
1433443020800
1566886041600
16267544166400
17535088332800
1832105299968000
192118949797888000
20148326485852160000
2110679506981355520000
22833001544545730560000
231666003089091461120000
24146608271840048578560000

[1,2,4,48,384,2304,4608,18432,552960,19906560,
 796262400,33443020800,66886041600,267544166400,
 535088332800,32105299968000,2118949797888000,
 148326485852160000,10679506981355520000,
 833001544545730560000,1666003089091461120000,
 146608271840048578560000]