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A018966 as a simple table

na(n)
23
39
452
5291
61445
76420
832959
9187727
101102665
116930612
1246522650
13320194002
142204132973
1515091492584
16102924229971

[3,9,52,291,1445,6420,32959,187727,1102665,
 6930612,46522650,320194002,2204132973,15091492584,
 102924229971]