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A273570 as a simple table

na(n)
01
15
221
393
4429
51869
67821
732013
8129549
9521229
102091021
118376333
1233529869
13134168589
14536772621
152147287053

[1,5,21,93,429,1869,7821,32013,129549,521229,
 2091021,8376333,33529869,134168589,536772621,
 2147287053]