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A302222 as a simple table

na(n)
15
2537
33425
438736
5338204
63420704
732181643
8310963650
92973099477
1028539661221
11273649285789
122623829240629
1325163515492994
14241281374262345
152313955414338689
1622188973218594562
17212790004250803955

[5,537,3425,38736,338204,3420704,32181643,
 310963650,2973099477,28539661221,273649285789,
 2623829240629,25163515492994,241281374262345,
 2313955414338689,22188973218594562,
 212790004250803955]