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A257556 as a triangular array

1
11
321
3731
4121241
423281851
43466522561
449126143853371
4642283282651284281
4803727007014441825291
49657313521705132069324863

A257556 as a square array

11334444444
12712233449648096
13122866126228372573
1418521433287001352
1525852657011705
16331284441320
1742182693
1852248
1963
1
11334444444
12712233449648096
13122866126228372573
1418521433287001352
1525852657011705
16331284441320
1742182693
1852248
1963
1