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A159972 Row sums of number triangle A159971. 1
1, -1, 0, 2, -7, 21, -63, 195, -624, 2054, -6916, 23712, -82498, 290510, -1033410, 3707850, -13402695, 48760365, -178405155, 656043855, -2423307045, 8987427465, -33453694485, 124936258125, -467995871775, 1757900019099, -6619846420551 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..26.

FORMULA

G.f.: (2c(-x)-1)/(1-xc(-x)^3)=(1-x+xc(-x))/(1+x)=(1-2x+sqrt(1+4x))/(2(1+x)), c(x) the g.f. of A000108.

Apparently n*a(n) +(5*n-6)*a(n-1) +2*(2*n-3)*a(n-2)=0. - R. J. Mathar, Oct 25 2012

CROSSREFS

Sequence in context: A320811 A005666 A291411 * A106271 A027990 A037520

Adjacent sequences:  A159969 A159970 A159971 * A159973 A159974 A159975

KEYWORD

easy,sign

AUTHOR

Paul Barry, Apr 28 2009

STATUS

approved

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Last modified September 30 03:03 EDT 2020. Contains 337432 sequences. (Running on oeis4.)