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Search: id:A143219
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| 1, 2, 6, 3, 9, 18, 4, 12, 24, 40, 5, 15, 30, 50, 75, 6, 18, 36, 60, 90, 126, 7, 21, 42, 70, 105, 147, 196, 8, 24, 48, 80, 120, 168, 224, 288, 9, 27, 54, 90, 135, 189, 252, 324, 405, 10, 30, 60, 100, 150, 210, 280, 360, 450, 550
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A002417: (1, 8, 30, 80, 175,...).
Right border = A002411: (1, 6, 18, 40,...).
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FORMULA
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Triangle read by rows, A127648 * A000012 * A127773, 1<=k<=n
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EXAMPLE
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First few rows of the triangle =
1;
2, 6;
3, 9, 18;
4, 12, 24, 40;
5, 15, 30, 50, 75;
6, 18, 36, 60, 90, 126;
7, 21, 42, 70, 105, 147, 196;
...
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CROSSREFS
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Cf. A127648, A127773, A002417, A002411.
Sequence in context: A078340 A136190 A079297 this_sequence A109465 A090705 A130684
Adjacent sequences: A143216 A143217 A143218 this_sequence A143220 A143221 A143222
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 30 2008
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