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Search: id:A128137
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| 1, -1, 4, -1, 1, 9, -1, 1, 5, 16, -1, 1, 5, 11, 25, -1, 1, 5, 11, 19, 36, -1, 1, 5, 11, 19, 29, 49, -1, 1, 5, 11, 19, 29, 41, 64, -1, 1, 5, 11, 19, 29, 41, 55, 81, -1, 1, 5, 11, 19, 29, 41, 55, 71, 100
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Deleting the right and left borders gives terms of A028387: (1, 5, 11, 29, 29, 41, 55, 71,...). Row sums = A064999: (1, 3, 9, 21, 41,...)
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FORMULA
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A002260 * A128132 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
-1, 4;
-1, 1, 9;
-1, 1, 5, 16;
-1, 1, 5, 11, 25;
-1, 1, 5, 11, 19, 36;
-1, 1, 5, 11, 19, 29, 49;
...
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CROSSREFS
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Cf. A002260, A128132, A028387, A128136, A064999.
Sequence in context: A132789 A100754 A055107 this_sequence A136100 A114188 A110511
Adjacent sequences: A128134 A128135 A128136 this_sequence A128138 A128139 A128140
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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 16 2007
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