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A018993 as a simple table

na(n)
23
37
442
5219
61011
75598
834646
9224809
101501860
1110113371
1268641436
13470506018
143252534733
1522668508169
16159249668294

[3,7,42,219,1011,5598,34646,224809,1501860,
 10113371,68641436,470506018,3252534733,
 22668508169,159249668294]