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A288518 as a triangular array

0
11
3123
649496
1014632214610
153731618161837315
21872711914248711987221
2819292891711103011103028917192928
3641181113608017561530196801756111360411836

A288518 as a square array

01361015212836
1124914637387219294118
3493221618711928917111360
6146161814248111030801756
1037371191110301530196
1587228917801756
211929111360
284118
36
01361015212836
1124914637387219294118
3493221618711928917111360
6146161814248111030801756
1037371191110301530196
1587228917801756
211929111360
284118
36