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”).

A045995 as a triangular array

1
11
111
1221
13831
15555551
18610676561081
113109469227465922746510946131
121317811225851433717190392490709135225851433717317811211
13414930352

A045995 as a square array

1111111111
112358132134
128556101094631781114930352
135567659227465225851433717
156109227465190392490709135
1810946225851433717
113317811
121
1
1111111111
112358132134
128556101094631781114930352
135567659227465225851433717
156109227465190392490709135
1810946225851433717
113317811
121
1