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A250138 as a simple table

na(n)
1343
21799
39156
446914
5217856
6974944
74350588
818667931
977880418
10322089271
111307443907
125208681584
1320546907053
1480150786624
15308819454899
161179461682136
174468650085856
1816786704855127
1962609587475559

[343,1799,9156,46914,217856,974944,4350588,
 18667931,77880418,322089271,1307443907,5208681584,
 20546907053,80150786624,308819454899,
 1179461682136,4468650085856,16786704855127,
 62609587475559]