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A110314 Inverse of number triangle related to Fibonacci numbers. 1
1, -1, 1, -2, -2, 1, 0, -6, -3, 1, 0, 0, -12, -4, 1, 0, 0, 0, -20, -5, 1, 0, 0, 0, 0, -30, -6, 1, 0, 0, 0, 0, 0, -42, -7, 1, 0, 0, 0, 0, 0, 0, -56, -8, 1, 0, 0, 0, 0, 0, 0, 0, -72, -9, 1, 0, 0, 0, 0, 0, 0, 0, 0, -90, -10, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, -110, -11, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -132, -12, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Row sums are 1-n^2 with g.f. (1-3x)/(1-x)^3. Diagonal sums are A110315. Inverse of A039948.

LINKS

Table of n, a(n) for n=0..90.

FORMULA

T(n, k)=if(n=k, 1, if(n-k=1, -binomial(n, 1), if(n-k=2, -2*binomial(n, 2), 0)))

EXAMPLE

Rows begin

1;

-1,1;

-2,-2,1;

0,-6,-3,1;

0,0,-12,-4,1;

0,0,0,-20,-5,1;

0,0,0,0,-30,-6,1;

CROSSREFS

Sequence in context: A266291 A064045 A258829 * A152882 A130167 A084938

Adjacent sequences:  A110311 A110312 A110313 * A110315 A110316 A110317

KEYWORD

easy,sign,tabl

AUTHOR

Paul Barry, Jul 19 2005

STATUS

approved

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Last modified October 22 02:46 EDT 2018. Contains 316431 sequences. (Running on oeis4.)