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Search: id:A126127
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| 1, -2, 1, -1, -2, 1, 5, -3, -2, 1, 2, 9, -5, -2, 1, -13, 9, 13, -7, -2, 1
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Inverse of A061554 = A046854; therefore A126127 = (A046854)^2.
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FORMULA
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Given M = Pascal's triangle with descending row terms, (A061554); A126127 = M^(-2).
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EXAMPLE
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First few rows of the triangle are:
1;
-2, 1;
-1, -2, 1;
5, -3, -2, 1;
2, 9, -5, -2, 1;
-13, 9, 13, -7, -2, 1;
...
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CROSSREFS
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Cf. A061554, A046854.
Sequence in context: A050473 A057593 A117008 this_sequence A102578 A103899 A093324
Adjacent sequences: A126124 A126125 A126126 this_sequence A126128 A126129 A126130
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KEYWORD
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tabl,uned,sign
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 17 2006
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