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A155225 as a simple table

na(n)
31
43
57
613
738
8180
9805
103814
1125700
12220335
132064779
1423174247
15331474649
165713874467
17116010028877
182863484145009
1986429492811884
203140385298427338
21137283404960168681
227274093873738312075

[1,3,7,13,38,180,805,3814,25700,220335,2064779,
 23174247,331474649,5713874467,116010028877,
 2863484145009,86429492811884,3140385298427338,
 137283404960168681,7274093873738312075]