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Search: id:A128078
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| 1, -1, 4, -1, -2, 9, -1, -2, -3, 16, -1, -2, -3, -4, 25, -1, -2, -3, -4, -5, 36, -1, -2, -3, -4, -5, -6, 49, -1, -2, -3, -4, -5, -6, -7, 64
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Row sums = the triangular numbers: (1, 3, 6, 10,...) Row sums of A128077 = A000326, the pentagonal numbers: (1, 5, 12, 22, 35,...)
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FORMULA
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A002260 * A128064 as infinite lower triangular matrices. Retain the right border of A128077 and change the signs of all other terms to (-).
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EXAMPLE
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First few rows of the triangle are:
1;
-1, 4;
-1, -2, 9;
-1, -2, -3, 16;
...
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CROSSREFS
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Cf. A002260, A128064, A128077, A000326.
Sequence in context: A133883 A004160 A128077 this_sequence A084604 A152253 A024569
Adjacent sequences: A128075 A128076 A128077 this_sequence A128079 A128080 A128081
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KEYWORD
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tabl,sign
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Feb 14 2007
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