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A056371 as a simple table

na(n)
12
24
36
412
512
640
728
896
9104
10280
11216
121248
13704
142800
154344
168928
178232
1844224
1929204
20136032
21176752
22419872
23381492
242150400
251678256
265594000
277461168
2822553408
2919175160
30134391040
3171585136
32269510016
33429726240
341073758360

[2,4,6,12,12,40,28,96,104,280,216,1248,704,2800,
 4344,8928,8232,44224,29204,136032,176752,419872,
 381492,2150400,1678256,5594000,7461168,22553408,
 19175160,134391040,71585136,269510016,429726240,
 1073758360]