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 A109581 E.g.f.: x/(1+x-x^3). 0
 0, 1, -2, 6, 0, -120, 1440, -10080, 40320, 362880, -10886400, 159667200, -1437004800, 0, 348713164800, -9153720576000, 146459529216000, -1067062284288000, -25609494822912000, 1338096104497152000, -34060628114472960000, 510909421717094400000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS D-finite with recurrence a(n) +n*a(n-1) -n*(n-1)*(n-2)*a(n-3)=0. - R. J. Mathar, Aug 20 2021 MAPLE G:=x/(1+x-x^3): Gser:=series(G, x=0, 26): 0, seq(n!*coeff(Gser, x^n), n=1..23); # yields signed sequence MATHEMATICA g[x_] = x/(-1 - x + x^3) h[x_, n_] = Dt[g[x], {x, n}] a[x_] = Table[h[x, n], {n, 0, 25}]; b = a[0] CROSSREFS Sequence having -G as o.g.f. is A104769. Sequence in context: A213323 A293016 A122685 * A056876 A255484 A021797 Adjacent sequences:  A109578 A109579 A109580 * A109582 A109583 A109584 KEYWORD sign AUTHOR Roger L. Bagula, Jun 29 2005 STATUS approved

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Last modified June 30 15:29 EDT 2022. Contains 354943 sequences. (Running on oeis4.)