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A280500 as a triangular array

1
02
013
0004
00125
000006
0001337
00000208
000010049
00000000010
000001027511
0000000006012
00000010000613
000000000204014
0000000133030715

A280500 as a square array

100000000000000
21000000000000
3010000000000
420100000000
50301000000
6320010000
700000100
84020001
9070003
1056023
110000
12643
1300
147
15
100000000000000
21000000000000
3010000000000
420100000000
50301000000
6320010000
700000100
84020001
9070003
1056023
110000
12643
1300
147
15