OFFSET
1,2
FORMULA
Conjecture: a(n)=12*a(n-2)-36*a(n-4) with G.f. x*(1+x)*(4*x+1) / (-1+6*x^2)^2 . - R. J. Mathar, Oct 15 2013
MATHEMATICA
r = {2, 3, 2, 3, 2, 3};
s = Flatten[{r, r, r, r, r, r, r, r, r}];
t[n_] := Part[s, Range[n]]
a[n_] := SymmetricPolynomial[n - 1, t[n]]
Table[a[n], {n, 1, 32}] (* A203232 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Dec 30 2011
STATUS
approved