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Search: id:A143311
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| 1, 4, 2, 9, 0, 3, 16, 8, 0, 4, 25, 0, 0, 0, 5, 36, 18, 12, 0, 0, 6, 49, 0, 0, 0, 0, 0, 7, 64, 32, 0, 16, 0, 0, 0, 8, 81, 0, 27, 0, 0, 0, 0, 0, 9, 100, 50, 0, 0, 20, 0, 0, 0, 0, 10, 121, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 144, 72, 48, 36, 0, 24, 0, 0, 0, 0, 0, 12, 169, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13
(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 = A064987, n*sigma(n): (1, 6, 12, 28, 30, 72, 56,...).
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FORMULA
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Triangle read by rows, A127648 * A126988; 1<=k<=n
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EXAMPLE
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First few rows of the triangle =
1;
4, 2;
9, 0, 3;
16, 8, 0, 4;
25, 0, 0, 0, 5;
36, 18, 12, 0, 0, 6;
49, 0, 0, 0, 0, 0, 7;
64, 32, 0, 16, 0, 0, 0, 8;
...
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CROSSREFS
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Cf. A127648, A126988, A064987.
Sequence in context: A084477 A046589 A072562 this_sequence A016696 A127470 A010649
Adjacent sequences: A143308 A143309 A143310 this_sequence A143312 A143313 A143314
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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), Aug 06 2008
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