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 A203159 (n-1)-st elementary symmetric function of {2,4,6,8,...,2n}. 1
 1, 6, 44, 400, 4384, 56448, 836352, 14026752, 262803456, 5441863680, 123436892160, 3044235018240, 81112101027840, 2322150583173120, 71092846618214400, 2317820965473484800, 80177108784198451200, 2932996578806543155200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA Conjecture: a(n) +2*(-2*n+1)*a(n-1) +4*(n-1)^2*a(n-2)=0. - R. J. Mathar, Oct 01 2016 EXAMPLE (n-1)-st elementary symmetric function of {2,4,6,8,...,2n}. Let esf abbreviate "elementary symmetric function".  Then 0th esf of {2}:  1 1st esf of {2,4}: 2+4=6 2nd esf of {2,4,6}: 2*4+2*6+4*6=44 MATHEMATICA f[k_] := 2 k; t[n_] := Table[f[k], {k, 1, n}] a[n_] := SymmetricPolynomial[n - 1, t[n]] Table[a[n], {n, 1, 16}] (* A203159 *) CROSSREFS Cf. A004041. Sequence in context: A090442 A286867 A084965 * A279085 A124996 A226045 Adjacent sequences:  A203156 A203157 A203158 * A203160 A203161 A203162 KEYWORD nonn AUTHOR Clark Kimberling, Dec 29 2011 STATUS approved

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Last modified May 19 22:32 EDT 2019. Contains 323411 sequences. (Running on oeis4.)