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A257558 as a triangular array

1
11
321
6731
16181241
4753371851
146162120642561
4715183902271003371
1562170812997883851464281
529157624410275014266062035291
18226197881521696645225238890327263101

A257558 as a square array

113616471464711562529118226
12718531625181708576219788
1312371203901299441015216
14186422778827509664
152510038514265225
16331466062388
1742203903
1852272
1963
110
1
113616471464711562529118226
12718531625181708576219788
1312371203901299441015216
14186422778827509664
152510038514265225
16331466062388
1742203903
1852272
1963
110
1