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A122749 as a simple table

na(n)
24
32
416
544
6256
7768
85184
925344
10186624
11996480
128294400
1357888000
14530841600
154006195200
1640642560000
17367408742400
184064256000000
1939358255104000
20474054819840000
215254107586560000
2268263894056960000
23804207665479680000
2411242684107325440000

[4,2,16,44,256,768,5184,25344,186624,996480,
 8294400,57888000,530841600,4006195200,40642560000,
 367408742400,4064256000000,39358255104000,
 474054819840000,5254107586560000,
 68263894056960000,804207665479680000,
 11242684107325440000]