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A038553 as a simple table

na(n)
11
21
33
41
515
66
77
81
963
1030
11341
1212
13819
1414
1515
161
17255
18126
199709
2060
2163
22682
232047
2424
2525575
261638
2713797
2828
29475107
3030
3131
321
331023
34510
354095
36252
373233097
3819418
394095
40120
4141943
42126
435461
441364
454095
464094
478388607
4848
492097151
5051150
51255
523276
533556769739
5427594
551048575

[1,1,3,1,15,6,7,1,63,30,341,12,819,14,15,1,255,
 126,9709,60,63,682,2047,24,25575,1638,13797,28,
 475107,30,31,1,1023,510,4095,252,3233097,19418,
 4095,120,41943,126,5461,1364,4095,4094,8388607,48,
 2097151,51150,255,3276,3556769739,27594,1048575]