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A231521 as a simple table

na(n)
121
21069
325556
4680302
517572772
6451200772
711683058939
8302190345444
97806399525348
10201765495180944
115215449996133433
12134798889001969231
133484039440752712049
1490050899758881308054
152327507605574582278738

[21,1069,25556,680302,17572772,451200772,
 11683058939,302190345444,7806399525348,
 201765495180944,5215449996133433,
 134798889001969231,3484039440752712049,
 90050899758881308054,2327507605574582278738]