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A218638 as a simple table

na(n)
11
23
31
47
515
61
715
863
963
101
1129
12255
13511
14251
151
1657
171017
184095
194087
201001
211
22113
234065
2432753
2565523
2632689
274001
281
29225
3016257
31262017
321048363
331048353
34261505
3516001
361
37449
3865025
392096129
4016773477
4133546641
4216773633
432092027
4463985
451

[1,3,1,7,15,1,15,63,63,1,29,255,511,251,1,57,1017,
 4095,4087,1001,1,113,4065,32753,65523,32689,4001,
 1,225,16257,262017,1048363,1048353,261505,16001,1,
 449,65025,2096129,16773477,33546641,16773633,
 2092027,63985,1]