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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: A005666 A353094 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 May 21 16:41 EDT 2024. Contains 372738 sequences. (Running on oeis4.)