login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A253871 as a triangular array

512
33283328
204803163220480
119040288000296960119040
679936254643239398402589968679936
3825920222016005239449650414592227297283825920
214261761921594086779822081052857184659280384

A253871 as a square array

512332820480119040679936382592021426176
332831632288000254643222201600192159408
20480296960393984052394496677982208
1190402589968504145921052857184
67993622729728659280384
3825920
512332820480119040679936382592021426176
332831632288000254643222201600192159408
20480296960393984052394496677982208
1190402589968504145921052857184
67993622729728659280384
3825920