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A124840 as a triangular array

1
1-2
1-42
1-66-1
1-812-4-2
1-1020-10-1010
1-1230-20-3060-30
1-1442-35-70210-21076
1-1646-56-140560-840608-173

A124840 as a square array

111111111
-2-4-6-8-10-12-14-16
261220304246
-1-4-10-20-35-56
-2-10-30-70-140
1060210560
-30-210-840
76608
-173

A124840 as an upper right triangle

111111111
-2-4-6-8-10-12-14-16
261220304246
-1-4-10-20-35-56
-2-10-30-70-140
1060210560
-30-210-840
76608
-173

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Last modified September 17 19:06 EDT 2021. Contains 347489 sequences. (Running on oeis4.)