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”).

A204177 as a triangular array

1
11
111
1001
10101
100001
1001001
10000001
100010001
1000000001
10000100001
100000000001
1000001000001
10000000

A204177 as a square array

11111111111111
1100000000000
101000000000
10010000000
1000100000
100001000
10000010
1000000
10000
1000
100
10
1
11111111111111
1100000000000
101000000000
10010000000
1000100000
100001000
10000010
1000000
10000
1000
100
10
1