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A296573 as a simple table

na(n)
17
231
3135
4616
52782
612544
756646
8255699
91154239
105210459
1123520746
12106176061
13479294501
142163605794
159766834956
1644088930859
17199023922776
18898423280994
194055614926483
2018307642707131
2182643393810855
22373064443621418

[7,31,135,616,2782,12544,56646,255699,1154239,
 5210459,23520746,106176061,479294501,2163605794,
 9766834956,44088930859,199023922776,898423280994,
 4055614926483,18307642707131,82643393810855,
 373064443621418]