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A208904 as a triangular array

1
31
561
71991
94442121
118513874151
13146363316115181
152318191059605165211
173441652298424701032224241
1948930607380837849741624292271
21670530116488

A208904 as a square array

13579111315171921
16194485146231344489670
1942138363819165230605301
1127431610592984738016488
11511560524708378
11816510324974
1212241624
124292
127
1
13579111315171921
16194485146231344489670
1942138363819165230605301
1127431610592984738016488
11511560524708378
11816510324974
1212241624
124292
127
1