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A210521 as a triangular array

1
35
246
8101214
79111315
171921232527
16182022242628
3032343638404244
293133353739414345
47495153555759616365
4648505254565860626466
68

A210521 as a square array

1328717163029474668
54109191832314948
61211212034335150
1413232236355352
15252438375554
272640395756
2842415958
44436160
456362
6564
66
1328717163029474668
54109191832314948
61211212034335150
1413232236355352
15252438375554
272640395756
2842415958
44436160
456362
6564
66