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A120603 as a simple table

na(n)
01
13
221
3399
49135
5233709
66400947
7183585897
85443737390
9165536020650
105133935821014
11161768728483362
125164132704296202
13166660621950110526
145428573285691233650
15178234125351736454070
165892439158797172244515

[1,3,21,399,9135,233709,6400947,183585897,
 5443737390,165536020650,5133935821014,
 161768728483362,5164132704296202,
 166660621950110526,5428573285691233650,
 178234125351736454070,5892439158797172244515]