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”).

A227507 as a triangular array

1
31
511
8231
92211
1544531
13242211
206648231
2146542511
27686694231
214646242211
401012121261548531
254104646242211
3912810126

A227507 as a square array

13589151320212721402539
112242646410412
13244668612108
1152456412410
132846612612
112292646
13544156
112242
13284
1152
132
11
1
13589151320212721402539
112242646410412
13244668612108
1152456412410
132846612612
112292646
13544156
112242
13284
1152
132
11
1