OFFSET
0,3
FORMULA
E.g.f.: -1/(1+x-x^3).
a(n) = n!*A104769(n+1). - R. J. Mathar, Aug 20 2021
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:=-1/(1+x-x^3):gser:=series(g, x=0, 26): -1, seq(n!*coeff(gser, x^n), n=1..22);
CROSSREFS
KEYWORD
sign
AUTHOR
Roger L. Bagula, Jun 29 2005
STATUS
approved