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A155266 as a simple table

na(n)
31
44
513
628
770
8418
93187
1020380
11144781
121561781
1323475489
14388651137
157313541265
16177385458253
175624711721417
18217536953984714

[1,4,13,28,70,418,3187,20380,144781,1561781,
 23475489,388651137,7313541265,177385458253,
 5624711721417,217536953984714]