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Search: id:A141045
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| A141045 |
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Triangle of subsequences of A140825 with a mirror symmetry. |
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+0
3
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| -1, 1, -1, -19, 11, -19, 27, -11, 11, -27, -863, 271, -191, 271, -863, 1375, -351, 191, -191, 351, -1375, -33953, 7297, -3233, 2497, -3233, 7297, -33953
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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The triangle shows A140825(3) in the first row and fills the n-th row by successively skipping two terms of A140825 and taking the next n terms. The absolute values of the triangle generated this way are symmetric with respect to mirror-operation at the row centers. We are essentially reading numerators down columns of the triangle in A140825, a(i,j), 0<=i<=j-2.
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EXAMPLE
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The triangle starts:
-1;
1, -1;
-19, 11, -19;
27, -11, 11, -27;
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CROSSREFS
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Sequence in context: A039942 A050276 A107808 this_sequence A157411 A166525 A083156
Adjacent sequences: A141042 A141043 A141044 this_sequence A141046 A141047 A141048
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KEYWORD
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sign,tabl,less
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jul 31 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 12 2008
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