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A226264 as a simple table

na(n)
136
284
3180
4372
5756
61524
73060
86132
912276
1024564
1149140
1298292
13196596
14393204
15786420
161572852
173145716
186291444
1912582900
2025165812
2150331636
22100663284
23201326580
24402653172
25805306356
261610612724
273221225460
286442450932
2912884901876
3025769803764

[36,84,180,372,756,1524,3060,6132,12276,24564,
 49140,98292,196596,393204,786420,1572852,3145716,
 6291444,12582900,25165812,50331636,100663284,
 201326580,402653172,805306356,1610612724,
 3221225460,6442450932,12884901876,25769803764]