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A056237 as a simple table

na(n)
16
221
340
463
590
6121
7156
8195
9238
10285
11336
12391
13450
14513
15580
16651
17726
18805
19888
20975
211066
221161
231260
241363
251470
261581
271696
281815
291938
302065
312196
322331
332470
342613
352760
362911
373066
383225
393388
403555
413726
423901
434080
444263
454450
464641
474836
485035

[6,21,40,63,90,121,156,195,238,285,336,391,450,
 513,580,651,726,805,888,975,1066,1161,1260,1363,
 1470,1581,1696,1815,1938,2065,2196,2331,2470,2613,
 2760,2911,3066,3225,3388,3555,3726,3901,4080,4263,
 4450,4641,4836,5035]