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A278734 as a triangular array

0
66
4015240
15519471947155
456173525890417352456
1128121520141081814108181215201128
24727124062863791699992428286379167124062472
4950363364950603111864105598656410559865506031118

A278734 as a square array

0640155456112824724950
61521947173521215207124063633649
40194758904141081828637916506031118
155173521410818999924286410559865
456121520286379166410559865
1128712406506031118
2472
0640155456112824724950
61521947173521215207124063633649
40194758904141081828637916506031118
155173521410818999924286410559865
456121520286379166410559865
1128712406506031118
2472