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A115634 Expansion of (1-4x^2)/(1-x^2). 2
1, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Row sums of number triangle A115633.

LINKS

Table of n, a(n) for n=0..59.

Index entries for linear recurrences with constant coefficients, signature (0,1).

FORMULA

a(n)=4*0^n-3*(1+(-1)^n)/2; a(n)=sum{k=0..n, A115633(n, k)}.

CROSSREFS

Sequence in context: A174559 A273128 A183035 * A010674 A021037 A053387

Adjacent sequences:  A115631 A115632 A115633 * A115635 A115636 A115637

KEYWORD

easy,sign

AUTHOR

Paul Barry, Jan 27 2006

STATUS

approved

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Last modified December 3 10:38 EST 2016. Contains 278699 sequences.