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A098501 as a simple table

na(n)
01
12
25
313
431
549
670
793
8121
9151
10186
11223
12265
13309
14358
15409
16465
17523
18586
19651
20721
21793
22870
23949
241033
251119
261210
271303
281401
291501
301606
311713
321825
331939
342058
352179
362305
372433
382566
392701
402841
412983
423130
433279
443433
453589
463750
473913
484081

[1,2,5,13,31,49,70,93,121,151,186,223,265,309,358,
 409,465,523,586,651,721,793,870,949,1033,1119,
 1210,1303,1401,1501,1606,1713,1825,1939,2058,2179,
 2305,2433,2566,2701,2841,2983,3130,3279,3433,3589,
 3750,3913,4081]