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A254491 as a triangular array

512
32643264
194562995219456
114880278848281024114880
660480252300839125762520832660480
3727552218229125132275250028672216419203727552
208721921869990406569640961018596736640020096

A254491 as a square array

512326419456114880660480372755220872192
326429952278848252300821822912186999040
19456281024391257651322752656964096
1148802520832500286721018596736
66048021641920640020096
3727552
512326419456114880660480372755220872192
326429952278848252300821822912186999040
19456281024391257651322752656964096
1148802520832500286721018596736
66048021641920640020096
3727552