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A203196 (n-1)-st elementary symmetric function of the first n terms of (2,1,4,3,6,5,8,7,...)=A103889. 1
1, 3, 14, 50, 324, 1764, 14832, 109584, 1136160, 10628640, 131172480, 1486442880, 21289201920, 283465647360, 4622628648960, 70734282393600, 1294139872972800, 22376988058521600, 453942134876160000, 8752948036761600000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(2n)=A000254(2n) for n=1,2,3...

LINKS

Table of n, a(n) for n=1..20.

MATHEMATICA

f[k_] := If[Mod[k, 2] == 0, k - 1, k + 1]

t[n_] := Table[f[k], {k, 1, n}]

a[n_] := SymmetricPolynomial[n - 1, t[n]]

Table[a[n], {n, 1, 14}]  (* A203196 *)

CROSSREFS

Cf. A103889.

Sequence in context: A164304 A098521 A084150 * A320826 A322199 A192882

Adjacent sequences:  A203193 A203194 A203195 * A203197 A203198 A203199

KEYWORD

nonn

AUTHOR

Clark Kimberling, Dec 30 2011

STATUS

approved

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Last modified May 13 23:41 EDT 2021. Contains 343868 sequences. (Running on oeis4.)