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A325255 as a simple table

na(n)
12
24
312
436
572
6192
71152
82592
92916
101492992
111990656
125308416
1328311552
146879707136
151761205026816
165566277615616
1779164837199872
183799912185593856
19115422332637413376
201332669751402954752
214803028329503971872

[2,4,12,36,72,192,1152,2592,2916,1492992,1990656,
 5308416,28311552,6879707136,1761205026816,
 5566277615616,79164837199872,3799912185593856,
 115422332637413376,1332669751402954752,
 4803028329503971872]