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”).

A034931 as a triangular array

1
11
121
1331
10201
112211
1230321
13133131
100020001
1100220011
12102020121
133122221331
1020300030201
11223300332211

A034931 as a square array

11111111111111
1230123012301
132231001322
10203000102
1133222233
121020203
13002200
1000200
111133
12303
1322
102
11
1
11111111111111
1230123012301
132231001322
10203000102
1133222233
121020203
13002200
1000200
111133
12303
1322
102
11
1