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A273251 as a simple table

na(n)
01
15
237
3181
4789
53285
613397
754101
8217429
9871765
103491157
1113972821
1255907669
13223663445
14894719317
153579008341

[1,5,37,181,789,3285,13397,54101,217429,871765,
 3491157,13972821,55907669,223663445,894719317,
 3579008341]