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A173323 as a simple table

na(n)
02
12
25
317
471
5359
62159
715119
8120959
91088639
1010886399
11119750399
121437004799
1318681062399
14261534873599
153923023103999
1662768369663999
171067062284287999
1819207121117183999
19364935301226495999

[2,2,5,17,71,359,2159,15119,120959,1088639,
 10886399,119750399,1437004799,18681062399,
 261534873599,3923023103999,62768369663999,
 1067062284287999,19207121117183999,
 364935301226495999]