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A250884 as a simple table

na(n)
1640002
22304492
35640102
411227928
519649066
631484612
747315662
867723312
993288658
10124592796
11162216822
12206741832
13258748922
14318819188
15387533726
16465473632
17553220002
18651353932
19760456518
20881108856
211013892042
221159387172

[640002,2304492,5640102,11227928,19649066,
 31484612,47315662,67723312,93288658,124592796,
 162216822,206741832,258748922,318819188,387533726,
 465473632,553220002,651353932,760456518,881108856,
 1013892042,1159387172]