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A140740 as a triangular array

1
21
421
8321
166321
3294321
641884321
128271254321
25654161054321
512813215654321
1024162482012654321
20482436425187654321
40964861285024

A140740 as a square array

1248163264128256512102420484096
1236918275481162243486
123481216324864128
123451015202550
123456121824
1234567
123456
12345
1234
123
12
1
1248163264128256512102420484096
1236918275481162243486
123481216324864128
123451015202550
123456121824
1234567
123456
12345
1234
123
12
1