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A253407 as a triangular array

81
480480
289021922890
175608168816817560
106540378282736237828106540
646240158472108950108950158472646240
39204486386023673484036983673486386023920448
23781448276309614893101739014

A253407 as a square array

81480289017560106540646240392044823781448
48021928168378281584726386022763096
28908168273621089503673481489310
17560378281089504036981739014
106540158472367348
646240638602
3920448

A253407 as an upper right triangle

81480289017560106540646240392044823781448
48021928168378281584726386022763096
28908168273621089503673481489310
17560378281089504036981739014
106540158472367348
646240638602
3920448

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Last modified June 27 19:31 EDT 2022. Contains 354898 sequences. (Running on oeis4.)