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A199825 as a simple table

na(n)
12
24
34
410
522
634
766
8138
9250
10472
11944
121806
133450
146772
1513172
1625478
1749794
1897348
19189772
20371246
21727506
221424586
232793034
245483342
2510766950
2621154424
2741599648
2881840866
29161080918
30317230034
31625030514
321231964394
332429323642

[2,4,4,10,22,34,66,138,250,472,944,1806,3450,6772,
 13172,25478,49794,97348,189772,371246,727506,
 1424586,2793034,5483342,10766950,21154424,
 41599648,81840866,161080918,317230034,625030514,
 1231964394,2429323642]