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A251840 as a simple table

na(n)
1641
2828
31803
42890
58582
621748
740492
8128431
9339592
10639794
112087597
125632271
1310609658
1435199882
1596069006
16180868454
17605781397
181663988392
193131743910
2010543905961
2129063878897
2254690404276
23184648426284
24509929622436

[641,828,1803,2890,8582,21748,40492,128431,339592,
 639794,2087597,5632271,10609658,35199882,96069006,
 180868454,605781397,1663988392,3131743910,
 10543905961,29063878897,54690404276,184648426284,
 509929622436]