OFFSET
0,4
COMMENTS
FORMULA
Conjecture: a(n) +2*(-n+1)*a(n-1) +(n^2-3*n-1)*a(n-2) +3*(n-2)*a(n-3) +a(n-4)=0. - R. J. Mathar, May 08 2014
MATHEMATICA
q = x^2; s = x + 1; z = 22;
p[0, x_] := 1; p[1, x_] := x;
p[n_, x_] := n*p[n - 1, x] + p[n - 2, x]*x^2;
Table[Expand[p[n, x]], {n, 0, 7}]
reduce[{p1_, q_, s_, x_}] :=
FixedPoint[(s PolynomialQuotient @@ #1 +
PolynomialRemainder @@ #1 &)[{#1, q, x}] &, p1]
t = Table[reduce[{p[n, x], q, s, x}], {n, 0, z}];
u1 = Table[Coefficient[Part[t, n], x, 0], {n, 1, z}]
(* A192924 *)
u2 = Table[Coefficient[Part[t, n], x, 1], {n, 1, z}]
(* A192925 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 12 2011
STATUS
approved