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A130186 as a simple table

na(n)
01
120
2508
317400
4788688
546032768
63372731136
7303444195840
832898989030400
94229445205094400
10635789661109862400
11110396039984094412800
1221901378996153294848000
134915686113045739601920000

[1,20,508,17400,788688,46032768,3372731136,
 303444195840,32898989030400,4229445205094400,
 635789661109862400,110396039984094412800,
 21901378996153294848000,4915686113045739601920000]