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A263705 as a simple table

na(n)
1475
218995
3437533
413341380
5414860767
613151405753
7409464954596
813041097884324
9416984172658896
1013411256346548047
11432777590466469475
1214030980958229441618
13456328306237092974195
1414885590516436588260515

[475,18995,437533,13341380,414860767,13151405753,
 409464954596,13041097884324,416984172658896,
 13411256346548047,432777590466469475,
 14030980958229441618,456328306237092974195,
 14885590516436588260515]