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A289670 as a simple table

na(n)
12
22
34
48
516
616
764
8128
9192
10320
11512
12768
132560
146656
1512288
1621504
1736864
1881920
19176128
20327680
21638976
221392640
232326528
244194304
259568256
2617301504
2730408704
2865536000
29121110528
30220200960
31484442112
32962592768
331837105152
344026531840
358304721920
3616206790656
3734712059904
3870934069248
39140190416896

[2,2,4,8,16,16,64,128,192,320,512,768,2560,6656,
 12288,21504,36864,81920,176128,327680,638976,
 1392640,2326528,4194304,9568256,17301504,30408704,
 65536000,121110528,220200960,484442112,962592768,
 1837105152,4026531840,8304721920,16206790656,
 34712059904,70934069248,140190416896]