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A257546 as a simple table

na(n)
01
11
22
36
424
540
680
7140
8280
9504
101008
111848
123696
136864
1413728
1525740
1651480
1797240
18194480
19369512
20739024
211410864
222821728
235408312
2410816624
2520801200
2641602400
2780233200
28160466400
29310235040
30620470080
311202160780
322404321560
334667212440

[1,1,2,6,24,40,80,140,280,504,1008,1848,3696,6864,
 13728,25740,51480,97240,194480,369512,739024,
 1410864,2821728,5408312,10816624,20801200,
 41602400,80233200,160466400,310235040,620470080,
 1202160780,2404321560,4667212440]