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Search: id:A126125
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| 1, -2, 1, 5, -2, 1, -11, 7, -2, 1, 27, -15, 9, -1, 1, -61, 44, -19, 11, -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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Sign A061544 as follows, then square it, getting A126125. A061554 = Pascal's triangle with descending terms in each row. 1; -1, 1; 2, -1, 1; -3, 3, -1, 1; 6, -4, 4, -1, 1; .. Row sums of A126125 = A077849: (1, 3, 8, 21, 54, 138...)
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FORMULA
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Square of signed A061554, where signs are (+ - + -...) by rows or columns.
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EXAMPLE
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First few rows of the triangle are:
1;
-2, 1;
5, -1, 1;
-11, 7, -2, 1;
27, -15, 9, -2, 1;
-61, 44, -19, 11, -2, 1;
..,
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CROSSREFS
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Cf. A061554, A077849.
Sequence in context: A088421 A104766 A105084 this_sequence A128514 A126075 A134032
Adjacent sequences: A126122 A126123 A126124 this_sequence A126126 A126127 A126128
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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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