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”).

A055132 as a triangular array

-1
1-1
-100
1-11-1
-1000-1
0-11111
10-10-10-1
110-110-11
-10-1000-10-1
10-1-11-1-1111
100000-10001
-1-111111-10-1-1-1
-10101000-10-101
1-10-1001000101-1

A055132 as a square array

-11-11-1011-111-1-11
-10-10-101000-10-1
0101-10-1-10110
-1010-10-1010-1
-11-11010110
1000-10100
-1-1-1-1-1101
1010-100
-1100-10
10-100
1-1-11
-100
11
-1
-11-11-1011-111-1-11
-10-10-101000-10-1
0101-10-1-10110
-1010-10-1010-1
-11-11010110
1000-10100
-1-1-1-1-1101
1010-100
-1100-10
10-100
1-1-11
-100
11
-1