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A331998 as a simple table

na(n)
11
21
33
41
513
616
71
839
9171
10125
111
12101
131091
142551
151296
161
17243
185498
1928838
2043653
2116807
221
23561
2424270
25243790
26780585
27850809
28262144
291
301263
3198661
321733035
3310073955
3422278189
3518689527
364782969
371
382797
39379693
4010996369
41106215619
42410994583
43677785807
44457947691
45100000000

[1,1,3,1,13,16,1,39,171,125,1,101,1091,2551,1296,
 1,243,5498,28838,43653,16807,1,561,24270,243790,
 780585,850809,262144,1,1263,98661,1733035,
 10073955,22278189,18689527,4782969,1,2797,379693,
 10996369,106215619,410994583,677785807,457947691,
 100000000]