OFFSET
1,2
MATHEMATICA
f[k_] := (2 k) (-1)^(k + 1)
t[n_] := Table[f[k], {k, 1, n}]
a[n_] := SymmetricPolynomial[n - 1, t[n]]
Table[a[n], {n, 1, 22}] (* A203238 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Clark Kimberling, Dec 30 2011
STATUS
approved