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A208539 as a simple table

na(n)
13
23
31
46
53
613
79
830
929
1078
1193
12224
13315
14687
151095
162250
173855
187685
1913797
2027012
2149939
2296909
23182361
24352698
25671091
261296858
272485533
284806078
299256395
3017920860
3134636833
3267159050
33130150587
34252745368

[3,3,1,6,3,13,9,30,29,78,93,224,315,687,1095,2250,
 3855,7685,13797,27012,49939,96909,182361,352698,
 671091,1296858,2485533,4806078,9256395,17920860,
 34636833,67159050,130150587,252745368]