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A274493 as a simple table

na(n)
20
31
42
53
66
713
827
957
10123
11267
12584
131289
142864
156399
1614373
1732435
1873498
19167175
20381551
21873541
222005622
234616895
2410653607
2524638263
2657097885
27132575577
28308378460
29718506295
301676706422
313918515001
329170350093
3321488961641
3450417138776
35118425429213
36278476687643

[0,1,2,3,6,13,27,57,123,267,584,1289,2864,6399,
 14373,32435,73498,167175,381551,873541,2005622,
 4616895,10653607,24638263,57097885,132575577,
 308378460,718506295,1676706422,3918515001,
 9170350093,21488961641,50417138776,118425429213,
 278476687643]