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”).

A320750 as a triangular array

1
11
121
1231
12461
12410101
1241125201
124113170361
1241132107196721
12411321163795741361
1241132117455145116812721

A320750 as a square array

11111111111
1222222222
134444444
16101111111111
1102531323232
12070107116117
136196379455
1725741451
11361681
1272
1
11111111111
1222222222
134444444
16101111111111
1102531323232
12070107116117
136196379455
1725741451
11361681
1272
1