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A120273 as a simple table

na(n)
11
21
313
429
5731
64357
7136141
81497401
952856987
10698076077
1149526267143
12574253997269
1372925181864501
141123720869207397
15143426539122302791
162236629947933814637
17422054527184135696827
188864360144543549996813

[1,1,13,29,731,4357,136141,1497401,52856987,
 698076077,49526267143,574253997269,72925181864501,
 1123720869207397,143426539122302791,
 2236629947933814637,422054527184135696827,
 8864360144543549996813]