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A163305 as a simple table

na(n)
10
25
310
440
5120
6400
71280
84160
913440
1043520
11140800
12455680
131474560
144771840
1515441920
1649971200
17161710080
18523304960
191693450240
205480120320
2117734041600
2257388564480
23185713295360
24600980848640
251944814878720

[0,5,10,40,120,400,1280,4160,13440,43520,140800,
 455680,1474560,4771840,15441920,49971200,
 161710080,523304960,1693450240,5480120320,
 17734041600,57388564480,185713295360,600980848640,
 1944814878720]