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A280477 as a simple table

na(n)
16
2162
34070
4100306
52272190
648481917
7990070284
819550495121
9375972018492
107077631558153
11130917736928836
122386330581933385
1342958320934899628
14765084427823374321
1513499826227679683140
16236266604028642547153

[6,162,4070,100306,2272190,48481917,990070284,
 19550495121,375972018492,7077631558153,
 130917736928836,2386330581933385,
 42958320934899628,765084427823374321,
 13499826227679683140,236266604028642547153]