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A177177 as a simple table

na(n)
01
17
215
381
4375
52113
611911
771221
8433343
92704049
1017125871
11110044549
12714925975
134690166833
1431020995831
15206646565637
161385159527343
179335979423089
1863232378792703
19430146956724677
202937659194003655

[1,7,15,81,375,2113,11911,71221,433343,2704049,
 17125871,110044549,714925975,4690166833,
 31020995831,206646565637,1385159527343,
 9335979423089,63232378792703,430146956724677,
 2937659194003655]