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A257548 as a simple table

na(n)
11
22
35
48
515
631
762
8124
9248
10496
11992
121984
133968
147936
1515872
1631744
1763488
18126976
19253952
20507904
211015808
222031616
234063232
248126464
2516252928
2632505856
2765011712
28130023424
29260046848
30520093696
311040187392
322080374784
334160749568
348321499136

[1,2,5,8,15,31,62,124,248,496,992,1984,3968,7936,
 15872,31744,63488,126976,253952,507904,1015808,
 2031616,4063232,8126464,16252928,32505856,
 65011712,130023424,260046848,520093696,1040187392,
 2080374784,4160749568,8321499136]