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A222376 as a simple table

na(n)
15
263
3498
420340
5271141
616985929
7286125939
820743320247
9373691424190
1027882988244881
11509605326368069
1238307687628079400
13703184052898346968
1452999539133762131621
15974700127061083249468
1673589121388228405830161

[5,63,498,20340,271141,16985929,286125939,
 20743320247,373691424190,27882988244881,
 509605326368069,38307687628079400,
 703184052898346968,52999539133762131621,
 974700127061083249468,73589121388228405830161]