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A317661 as a simple table

na(n)
00
13
25
315
41
54
63
716777215
81
92
104
111
1215
135
143
1522300745198530623141535718272648361505980415
161
172
185
1915
201
214
222
231
2416777215
253
264
271
2815
295
303

[0,3,5,15,1,4,3,16777215,1,2,4,1,15,5,3,
 22300745198530623141535718272648361505980415,1,2,
 5,15,1,4,2,1,16777215,3,4,1,15,5,3]