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A251836 as a simple table

na(n)
1678
23354
33354
418124
527554
618124
797316
8262404
9262404
1097316
11518514
122298772
134182084
142298772
15518514
162764828
1720314774
1860982362
1960982362
2020314774
212764828
2214778068
23182241310
24909331750
251464435968
26909331750

[678,3354,3354,18124,27554,18124,97316,262404,
 262404,97316,518514,2298772,4182084,2298772,
 518514,2764828,20314774,60982362,60982362,
 20314774,2764828,14778068,182241310,909331750,
 1464435968,909331750]