OFFSET
1,2
COMMENTS
Equivalently, 1 together with numbers occurring at least three times in columns k >= 1 of Bernoulli's triangle.
Equivalently, 1 together with numbers occurring at least twice in columns k >= 2 of Bernoulli's triangle.
CROSSREFS
KEYWORD
nonn
AUTHOR
Pontus von Brömssen, Aug 19 2024
STATUS
approved