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A041644 as a simple table

na(n)
018
137
2240
3277
42456
55189
67645
720479
828124
976727
10641940
11718667
124953942
1310626551
14387509778
15785646107
165101386420
175887032527
1852197646636
19110282325799
20162479972435
21435242270669

[18,37,240,277,2456,5189,7645,20479,28124,76727,
 641940,718667,4953942,10626551,387509778,
 785646107,5101386420,5887032527,52197646636,
 110282325799,162479972435,435242270669]