OFFSET
0,3
FORMULA
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
KEYWORD
sign
AUTHOR
Roger L. Bagula, Jun 29 2005
STATUS
approved