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A252872 as a simple table

na(n)
13
226
3153
4615
51953
65281
712686
827805
956624
10108549
11197804
12345216
13580452
14944778
151494415
162304572
173474241
185131844
197441827
2010612301
2114903835
2220639511
2328216356
2438118271
2550930582
2667356343
2788234526
28114560238

[3,26,153,615,1953,5281,12686,27805,56624,108549,
 197804,345216,580452,944778,1494415,2304572,
 3474241,5131844,7441827,10612301,14903835,
 20639511,28216356,38118271,50930582,67356343,
 88234526,114560238]