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A256320 as a simple table

na(n)
00
11
25
312
421
533
648
765
885
9108
10133
11161
12192
13225
14261
15300
16341
17385
18432
19481
20533
21588
22645
23705
24768
25833
26901
27972
281045
291121
301200
311281
321365
331452
341541
351633
361728
371825
381925
392028
402133
412241
422352
432465
442581
452700
462821
472945
483072
493201

[0,1,5,12,21,33,48,65,85,108,133,161,192,225,261,
 300,341,385,432,481,533,588,645,705,768,833,901,
 972,1045,1121,1200,1281,1365,1452,1541,1633,1728,
 1825,1925,2028,2133,2241,2352,2465,2581,2700,2821,
 2945,3072,3201]