OFFSET
1,1
COMMENTS
All terms are even (as the presence of 1 in a set does not change the least common multiple of its elements).
FORMULA
EXAMPLE
Triangle begins:
1: [2]
2: [2, 2]
3: [2, 2]
4: [2, 2, 4]
5: [2, 2]
6: [2, 2, 2, 10]
7: [2, 2]
8: [2, 2, 4, 8]
9: [2, 2, 4]
10: [2, 2, 2, 10]
11: [2, 2]
12: [2, 2, 2, 4, 10, 44]
13: [2, 2]
14: [2, 2, 2, 10]
15: [2, 2, 2, 10]
PROG
(PARI) row(n) = { my (d=divisors(n), r=vector(#d)); for (m=0, 2^#d-1, r[setsearch(d, lcm(vecextract(d, m)))]++); r }
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Rémy Sigrist, Oct 31 2020
STATUS
approved