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A197131 as a simple table

na(n)
24
346
4544
57216
6108096
71816704
833951744
9699512832
1015765626880
11386046443520
1210208951009280
13290039357767680
148811722692362240
15285113464809062400
169789232245217689600
17355501479519741542400
1813615286053738276454400
19548476851979845579571200

[4,46,544,7216,108096,1816704,33951744,699512832,
 15765626880,386046443520,10208951009280,
 290039357767680,8811722692362240,
 285113464809062400,9789232245217689600,
 355501479519741542400,13615286053738276454400,
 548476851979845579571200]