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Search: id:A116949
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| A116949 |
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Riordan array ((1-x^3)/(1+2x^2),x). |
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+0
4
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| 1, 0, 1, -2, 0, 1, -1, -2, 0, 1, 4, -1, -2, 0, 1, 2, 4, -1, -2, 0, 1, -8, 2, 4, -1, -2, 0, 1, -4, -8, 2, 4, -1, -2, 0, 1, 16, -4, -8, 2, 4, -1, -2, 0, 1, 8, 16, -4, -8, 2, 4, -1, -2, 0, 1, -32, 8, 16, -4, -8, 2, 4, -1, -2, 0, 1, -16, -32, 8, 16, -4, -8, 2, 4, -1, -2, 0, 1, 64, -16, -32, 8, 16, -4, -8, 2, 4, -1, -2, 0, 1
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Sequence array of (-2)^(n/2)(1+(-1)^n)/2-(-2)^((n-3)/2)(1-(-1)^n)/2-(comb(1,n)-comb(0,n))/2. Inverse of A110128 [this cross-reference is wrong - njas, Jan 01 2008]. Row sums are A117575. Diagonal sums are A117576.
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EXAMPLE
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Number triangle begins
1,
0, 1,
-2, 0, 1,
-1, -2, 0, 1,
4, -1, -2, 0, 1,
2, 4, -1, -2, 0, 1,
-8, 2, 4, -1, -2, 0, 1,
-4, -8, 2, 4, -1, -2, 0, 1,
16, -4, -8, 2, 4, -1, -2, 0, 1
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CROSSREFS
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Sequence in context: A025871 A051010 A130027 this_sequence A114708 A084927 A072670
Adjacent sequences: A116946 A116947 A116948 this_sequence A116950 A116951 A116952
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KEYWORD
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easy,sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 29 2006
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EXTENSIONS
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Entry revised by njas, Apr 10 2006
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