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A138981 as a simple table

na(n)
01
14
29
316
427
540
657
776
899
9128
10159
11196
12237
13280
14327
15380
16441
17508
18579
19652
20731
21814
22903
231000
241101
251204
261311
271420
281533
291660
301791
311928
322067
332216
342367
352524
362691
372864
383043
393224
403415
413608
423805
434004
444215
454438
464665
474894

[1,4,9,16,27,40,57,76,99,128,159,196,237,280,327,
 380,441,508,579,652,731,814,903,1000,1101,1204,
 1311,1420,1533,1660,1791,1928,2067,2216,2367,2524,
 2691,2864,3043,3224,3415,3608,3805,4004,4215,4438,
 4665,4894]