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A281971 as a simple table

na(n)
01
13
27
320
449
5110
6227
7435
8786
91358
102259
113621
125627
138538
1412655
1518318
1626049
1736487
1850236
1968131
2091412
21121207
22158659
23205768
24264786
25337240
26425738
27534408
28665866
29822789
301011364
311237211
321502645
331814854
342184786
352615980
363114026
373695678

[1,3,7,20,49,110,227,435,786,1358,2259,3621,5627,
 8538,12655,18318,26049,36487,50236,68131,91412,
 121207,158659,205768,264786,337240,425738,534408,
 665866,822789,1011364,1237211,1502645,1814854,
 2184786,2615980,3114026,3695678]