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A281204 as a simple table

na(n)
120
2166
3537
41358
53137
66838
714375
829416
958984
10116466
11227134
12438532
13839659
141596460
153017310
165673426
1710619999
1819801344
1936791933
2068149580
21125882603
22231941798
23426388234
24782226746
251432314394
262618121324
274778002317

[20,166,537,1358,3137,6838,14375,29416,58984,
 116466,227134,438532,839659,1596460,3017310,
 5673426,10619999,19801344,36791933,68149580,
 125882603,231941798,426388234,782226746,
 1432314394,2618121324,4778002317]