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A141543
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Triangle T(n,k) read by brows: T(n,2k)=k, T(n,2k+1) = k-n, for 0<=k<=n.
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1
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0, 0, -1, 0, -2, 1, 0, -3, 1, -2, 0, -4, 1, -3, 2, 0, -5, 1, -4, 2, -3, 0, -6, 1, -5, 2, -4, 3, 0, -7, 1, -6, 2, -5, 3, -4, 0, -8, 1, -7, 2, -6, 3, -5, 4, 0, -9, 1, -8, 2, -7, 3, -6, 4, -5, 0, -10, 1, -9, 2, -8, 3, -7, 4, -6, 5
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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COMMENTS
| In each row, two bisections count up.
Mentioned in A124072. [How/where? R. J. Mathar, Jul 07 2011]
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EXAMPLE
| 0;
0, -1;
0, -2, 1;
0, -3, 1, -2;
0, -4, 1, -3, 2;
0, -5, 1, -4, 2, -3;
0, -6, 1, -5, 2, -4, 3;
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MAPLE
| A141543 := proc(n, k) if type(k, 'even') then k/2; else (k-1)/2-n ; end if; end proc:
seq(seq(A141543(n, k), k=0..n), n=0..15) ; # R. J. Mathar, Jul 07 2011
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CROSSREFS
| Sequence in context: A143151 A130106 A127093 * A182720 A146540 A162922
Adjacent sequences: A141540 A141541 A141542 * A141544 A141545 A141546
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KEYWORD
| sign,easy,tabl
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Aug 16 2008
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