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A232493 as a simple table

na(n)
01
14
220
396
4528
52880
616704
796768
8573696
93400704
1020321280
11121430016
12727584768
134359536640
1426145275904
15156799991808
16940656623616
175643079778304
1833856758743040
19203130232897536
201218760758263808
217312440714854400
2243874396619669504
23263244893701275648
241579466390174171136

[1,4,20,96,528,2880,16704,96768,573696,3400704,
 20321280,121430016,727584768,4359536640,
 26145275904,156799991808,940656623616,
 5643079778304,33856758743040,203130232897536,
 1218760758263808,7312440714854400,
 43874396619669504,263244893701275648,
 1579466390174171136]