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”).

A330408 as a triangular array

1
22
323
4434
54645
666856
76681067
8868101278
989810121489
101091210121416910
1110121215121416181011
12121212151814161820

A330408 as a square array

123456789101112
22446688101012
336666991212
448888121212
55101010101515
661212121218
7714141414
88161616
991818
101020
11
123456789101112
22446688101012
336666991212
448888121212
55101010101515
661212121218
7714141414
88161616
991818
101020
11