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A209135 as a triangular array

1
21
353
414165
530543911
6551441719821
79132956150322943
814067215341928138053285
9204126036906106608436361203171
102852208805816852218901806092492694

A209135 as a square array

12345678910
1514305591140204285
3165414432967212602208
539171561153436908058
11985031928610616852
212291380608421890
43532363618060
8512039249
1712694
12345678910
1514305591140204285
3165414432967212602208
539171561153436908058
11985031928610616852
212291380608421890
43532363618060
8512039249
1712694