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A141543 Triangle T(n,k) read by brows: T(n,2k)=k, T(n,2k+1) = k-n, for 0<=k<=n. 1
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; text; internal format)
OFFSET

0,5

COMMENTS

In each row, two bisections count up.

Mentioned in A124072. [How/where? - R. J. Mathar, Jul 07 2011]

LINKS

Table of n, a(n) for n=0..65.

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;

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

MATHEMATICA

Flatten[Table[If[EvenQ[k], k/2, (k-1)/2-n], {n, 0, 10}, {k, 0, n}]] (* Harvey P. Dale, Sep 24 2013 *)

CROSSREFS

Sequence in context: A143151 A130106 A127093 * A333432 A333500 A182720

Adjacent sequences:  A141540 A141541 A141542 * A141544 A141545 A141546

KEYWORD

sign,easy,tabl

AUTHOR

Paul Curtz, Aug 16 2008

STATUS

approved

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Last modified May 31 13:01 EDT 2020. Contains 334748 sequences. (Running on oeis4.)