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A027745 as a simple table

na(n)
01
14
216
396
4640
55280
627648
7340704
81966080
915676416
10124608000
111341648000
127166361600
1397763702400
14629315721216
154680529920000
1642316647628800
17483414202656000
182396062681399296
1935513562609100800
20211942058803200000
212006922093666287616
2216837843397760000000

[1,4,16,96,640,5280,27648,340704,1966080,15676416,
 124608000,1341648000,7166361600,97763702400,
 629315721216,4680529920000,42316647628800,
 483414202656000,2396062681399296,
 35513562609100800,211942058803200000,
 2006922093666287616,16837843397760000000]