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A253612 as a simple table

na(n)
16916
2131378
32501365
448041910
5920906077
617665509894
7338854514523
86500005331011
9124684145636827
102391719505327311
1145878483658735443
12880051229318868232
1316881337031496800473
14323821540743313385720

[6916,131378,2501365,48041910,920906077,
 17665509894,338854514523,6500005331011,
 124684145636827,2391719505327311,
 45878483658735443,880051229318868232,
 16881337031496800473,323821540743313385720]