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”).

A117408 as a triangular array

1
01
101
1001
20001
210001
3100001
41000001
511000001
6210000001
82100000001
1021100000001
12311000000001
15411000000000

A117408 as a square array

10112234568101215
1000111122234
100000111111
10000000111
1000000000
100000000
10000000
1000000
100000
10000
1000
100
10
10112234568101215
1000111122234
100000111111
10000000111
1000000000
100000000
10000000
1000000
100000
10000
1000
100
10