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A027421
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Triangle T(n,k) = number of distinct products ij with k<=i,j<=n, for 0<=k<=n.
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2
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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
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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EXAMPLE
| 1; 2,1; 4,3,1; 7,6,3,1; 10,9,6,3,1; ...
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CROSSREFS
| Cf. A027384, A027422.
Sequence in context: A107661 A126570 A048790 * A131252 A133805 A131254
Adjacent sequences: A027418 A027419 A027420 * A027422 A027423 A027424
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KEYWORD
| tabl,nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Olivier Gerard, Nov 15 1997
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