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A259039 as a simple table

na(n)
156
2248
3328
4496
51016
62032
76462
88128
917412
1020538
1165528
12131056
13524224
141048568
152097136
162096896
174194296
188388592
198388544
2033554368
2133554176
22134217472
232147467264
248589918208

[56,248,328,496,1016,2032,6462,8128,17412,20538,
 65528,131056,524224,1048568,2097136,2096896,
 4194296,8388592,8388544,33554368,33554176,
 134217472,2147467264,8589918208]