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A109266 Diagonal sums of Riordan array (1-x-x^2,x(1-x)). 2
1, -1, 0, -2, 1, -2, 3, -3, 5, -6, 8, -11, 14, -19, 25, -33, 44, -58, 77, -102, 135, -179, 237, -314, 416, -551, 730, -967, 1281, -1697, 2248, -2978, 3945, -5226, 6923, -9171, 12149, -16094, 21320, -28243, 37414, -49563, 65657, -86977, 115220, -152634, 202197, -267854, 354831, -470051, 622685, -824882 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..51.

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

FORMULA

G.f.: (1-x-x^2)/(1-x^2+x^3); a(n)=a(n-2)-a(n-3).

CROSSREFS

Sequence in context: A331849 A015739 A015746 * A022876 A242692 A316231

Adjacent sequences:  A109263 A109264 A109265 * A109267 A109268 A109269

KEYWORD

easy,sign

AUTHOR

Paul Barry, Jun 24 2005

STATUS

approved

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Last modified April 19 02:19 EDT 2021. Contains 343105 sequences. (Running on oeis4.)