login
A027421
Triangle T(n,k) = number of distinct products ij with k<=i,j<=n, for 0<=k<=n.
2
1, 2, 1, 4, 3, 1, 7, 6, 3, 1, 10, 9, 6, 3, 1, 15, 14, 10, 6, 3, 1, 19, 18, 14, 10, 6, 3, 1, 26, 25, 20, 15, 10, 6, 3, 1, 31, 30, 25, 20, 15, 10, 6, 3, 1, 37, 36, 31, 26, 20, 15, 10, 6, 3, 1, 43, 42, 37, 32, 26, 21, 15, 10, 6, 3, 1, 54, 53, 47, 41, 34, 28, 21, 15, 10, 6, 3, 1
OFFSET
0,2
EXAMPLE
1; 2,1; 4,3,1; 7,6,3,1; 10,9,6,3,1; ...
CROSSREFS
Sequence in context: A107661 A126570 A048790 * A131252 A345123 A133805
KEYWORD
tabl,nonn,easy
AUTHOR
EXTENSIONS
More terms from Olivier Gérard, Nov 15 1997
STATUS
approved