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A291820 as a triangular array

1
10
120
1750
11638140
130157189420
15047712459041320
17711975616879142424290
111226321988155566578541972314300
11565250593272652044919473638809136648620
121097141557831035442306227140395512220933423124167960
1275169293702053472513152176743197972331463341132854151963169587860
13522809481187710331673636782541979835403106188562359591857841954191384162080120

A291820 as a square array

1111111111111
02716305077112156210275352
053815747711972632525097141692928094
014189124556161988159327155783370205811877
0429048791555662652041035442347251310331673
013242425785449194730622711521767463678254
042919723363880403955131979723197983540
0143091366222093331463341310618856
0486242312413285415235959185
016796196316978419541
0587869138416
0208012
0

A291820 as an upper right triangle

1111111111111
02716305077112156210275352
053815747711972632525097141692928094
014189124556161988159327155783370205811877
0429048791555662652041035442347251310331673
013242425785449194730622711521767463678254
042919723363880403955131979723197983540
0143091366222093331463341310618856
0486242312413285415235959185
016796196316978419541
0587869138416
0208012
0

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Last modified September 17 03:10 EDT 2024. Contains 375984 sequences. (Running on oeis4.)