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A257264 as a triangular array

2
51
630
9410
127300
13104100
141083000
1711871000
20158740000
2118117430000
24181684310000
2722161573100000
282319151141000000
2925191611830000000

A257264 as a square array

256912131417202124272829
1347101011151818222325
01348881116161919
00137778151516
000144471111
000033348
00001113
0000000
000000
00000
0000
000
00
0
256912131417202124272829
1347101011151818222325
01348881116161919
00137778151516
000144471111
000033348
00001113
0000000
000000
00000
0000
000
00
0