OFFSET
1,4
COMMENTS
Sum of entries in n-th row is A003418(n), the least common multiple of integers 1 to n.
EXAMPLE
Triangle begins:
1
1 1
2 3 1
4 4 3 1
16 20 16 7 1
16 20 12 6 5 1
PROG
(PARI) lcmn(n) = lcm(vector(n, k, k));
rowd(n) = {v = vector(n); for (k=1, lcmn(n), d = divisors(k); v[sum(j=1, #d, d[j]<=n)]++; ); v; } \\ Michel Marcus, Apr 29 2017
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Matthew Vandermast, Jun 19 2004
STATUS
approved