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”).

A015141 as a triangular array

1
11
1-161
12732731
1-464079170-46401
1788812287549022875490788811
1-13409766611095491-1123644068806611095491-13409761
1227965931910605255923552052942096931552052942096931

A015141 as a square array

11111111
1-16273-464078881-134097622796593
1273791702287549066110954911910605255923
1-464022875490-112364406880552052942096931
1788816611095491552052942096931
1-1340976
1
11111111
1-16273-464078881-134097622796593
1273791702287549066110954911910605255923
1-464022875490-112364406880552052942096931
1788816611095491552052942096931
1-1340976
1