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”).

A106468 as a triangular array

1
11
101
1111
00101
001111
0000101
00001111
000000101
0000001111
00000000101
000000001111
0000000000101
00000000001111

A106468 as a square array

11110000000000
1010000000000
111100000000
10100000000
1111000000
101000000
11110000
1010000
111100
10100
1111
101
11
1
11110000000000
1010000000000
111100000000
10100000000
1111000000
101000000
11110000
1010000
111100
10100
1111
101
11
1