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1, 4, -1, 8, -1, -1, 15, -4, -1, 0, 21, -4, -1, 0, -1, 33, -8, -4, 0, -1, 1, 41, -8, -4, 0, -1, 1, -1, 56, -15, -4, 0, -1, 1, -1, 0, 69, -15, -8, 0, -1, 1, -1, 0, 0, 87, -21, -8, 0, -4, 1, -1, 0, 0, 1, 99, -21, -8, 0, -4, 1, -1, 0, 0, 1, -1, 127, -33, -15, 0, -4, 4, -1, 0, 0, 1, -1, 0
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Left border = A024916: (1, 4, 8, 15, 21, 33,...).
Right border = mu(n), A008683.
Row sums = T(n), triangular numbers.
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LINKS
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Table of n, a(n) for n=1..78.
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FORMULA
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Triangle read by rows, A000012 * A143317; 1<=k<=n
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EXAMPLE
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First few rows of the triangle =
1;
4, -1;
8, -1, -1
15, -4, -1, 0;
21, -4, -1, 0, -1;
33, -8, -4, 0, -1, 1;
41, -3, -4, 0, -1, 1, -1;
...
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CROSSREFS
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Cf. A143317, A008683, A024916.
Sequence in context: A134250 A139045 A084884 * A089146 A101512 A085994
Adjacent sequences: A143317 A143318 A143319 * A143321 A143322 A143323
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KEYWORD
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sign,tabl
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AUTHOR
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Gary W. Adamson, Aug 07 2008
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EXTENSIONS
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Corrected last few terms. - Stuart Orford (sjorford(AT)gmail.com), Dec 22 2008
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STATUS
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approved
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