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A188576 as a simple table

na(n)
10
21
31
44
56
614
726
854
9105
10213
11423
12849
131697
143399
156799
1613608
1727220
1854451
19108901
20217789
21435517
22870892
231741467
243482322
256963512
2613925078
2727846979
2855689150
29111371677
30222735709
31445466058
32890938357
331781916885
343563957177
357128223846

[0,1,1,4,6,14,26,54,105,213,423,849,1697,3399,
 6799,13608,27220,54451,108901,217789,435517,
 870892,1741467,3482322,6963512,13925078,27846979,
 55689150,111371677,222735709,445466058,890938357,
 1781916885,3563957177,7128223846]