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A209274 as a triangular array

1
23
456
89910
1617151415
323327222021
64655138302728
128129997050393536
2562571951349063494445
51251338726217011177605455
1024102577151833020713392726566

A209274 as a square array

12481632641282565121024
3591733651292575131025
6915275199195387771
1014223870134262518
1520305090170330
21273963111207
28354977133
36446092
455472
5565
66
12481632641282565121024
3591733651292575131025
6915275199195387771
1014223870134262518
1520305090170330
21273963111207
28354977133
36446092
455472
5565
66