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A053636 as a simple table

na(n)
00
12
24
312
416
540
672
7140
8256
9540
101040
112068
124128
138216
1416408
1532880
1665536
17131104
18262296
19524324
201048640
212097480
224194344
238388652
2416777728
2533554600
2667108912
27134218836
28268435552
29536870968
301073744160
312147483708

[0,2,4,12,16,40,72,140,256,540,1040,2068,4128,
 8216,16408,32880,65536,131104,262296,524324,
 1048640,2097480,4194344,8388652,16777728,33554600,
 67108912,134218836,268435552,536870968,1073744160,
 2147483708]