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A221549 as a simple table

na(n)
12
272
31930
447976
51196232
629856238
7745144793
818597229593
9464150326595
1011584303335876
11289122180321148
127215940813826595
13180096192359343564
144494859317429619337
15112183162016821282782
162799878918782194289254

[2,72,1930,47976,1196232,29856238,745144793,
 18597229593,464150326595,11584303335876,
 289122180321148,7215940813826595,
 180096192359343564,4494859317429619337,
 112183162016821282782,2799878918782194289254]