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A255506 as a simple table

na(n)
02
112
2120
3504
41440
53168
63931200
78640
841126400
9579156480
102395008000
111001548800
122615348736000
135748019200
1421670032384000
157491404919398400
1621341245685760000
17251073478656000
1824574743184592240640000
1976828484468736000
2065834328341259878400000

[2,12,120,504,1440,3168,3931200,8640,41126400,
 579156480,2395008000,1001548800,2615348736000,
 5748019200,21670032384000,7491404919398400,
 21341245685760000,251073478656000,
 24574743184592240640000,76828484468736000,
 65834328341259878400000]