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A274798 as a simple table

na(n)
12
28
330
4112
5420
61572
75888
822048
982568
10309200
111157904
124336144
1316238112
1460808896
15227718752
16852767104
173193464512
1811958969152
1944784259584
20167709263104
21628042022016
222351908141824
238807486941952
2432982506778880

[2,8,30,112,420,1572,5888,22048,82568,309200,
 1157904,4336144,16238112,60808896,227718752,
 852767104,3193464512,11958969152,44784259584,
 167709263104,628042022016,2351908141824,
 8807486941952,32982506778880]