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”).

A290456 as a triangular array

1
10
110
1410
15510
120210
1322310
10343010
113113110
1444444410
15222222510
123000003210
1353000035310

A290456 as a square array

1111111111111
014523014523
01502334235
0122414203
013314200
01034200
0114200
014200
01533
0125
013
01
0
1111111111111
014523014523
01502334235
0122414203
013314200
01034200
0114200
014200
01533
0125
013
01
0