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”).

A047100 as a triangular array

1
11
111
1211
13321
146531
151011541
16152116551
17213637211061
1828577358311671
19368513013189312381
11045121215261220

A047100 as a square array

111111111111
112345678910
1136101521283645
1251121365785121
135163773130215
1452158131261
15103189220
161631
1723
18
1
111111111111
112345678910
1136101521283645
1251121365785121
135163773130215
1452158131261
15103189220
161631
1723
18
1