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A289671 as a simple table

na(n)
10
22
34
48
516
648
764
8128
9320
10704
111536
123328
135632
149728
1520480
1644032
1794208
18180224
19348160
20720896
211458176
222801664
236062080
2412582912
2523986176
2649807360
27103809024
28202899456
29415760384
30853540864
311663041536

[0,2,4,8,16,48,64,128,320,704,1536,3328,5632,9728,
 20480,44032,94208,180224,348160,720896,1458176,
 2801664,6062080,12582912,23986176,49807360,
 103809024,202899456,415760384,853540864,
 1663041536]