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A155720 as a simple table

na(n)
02
14
24
321
48
521
6211
735
835
9211
103025
11342
1284
13342
143025
1555441
165047
17560
18560
195047
2055441
211235521
2295048
237992
241440
257992
2695048
271235521
2832432401
292162169
30154530
3112870
3212870
33154530
342162169
3532432401
36980179201
3757657610
383603710

[2,4,4,21,8,21,211,35,35,211,3025,342,84,342,3025,
 55441,5047,560,560,5047,55441,1235521,95048,7992,
 1440,7992,95048,1235521,32432401,2162169,154530,
 12870,12870,154530,2162169,32432401,980179201,
 57657610,3603710]