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A294426 as a simple table

na(n)
01
13
28
315
428
549
686
7144
8240
9395
10647
111055
121718
132789
144524
157331
1611874
1719225
1831120
1950367
2081510
21131901
22213436
23345363
24558828
25904220
261463078
272367329
283830439
296197801
3010028274
3116226110
3226254420
3342480567
3468735025
35111215631
36179950696

[1,3,8,15,28,49,86,144,240,395,647,1055,1718,2789,
 4524,7331,11874,19225,31120,50367,81510,131901,
 213436,345363,558828,904220,1463078,2367329,
 3830439,6197801,10028274,16226110,26254420,
 42480567,68735025,111215631,179950696]