OFFSET
2,1
FORMULA
Empirical g.f.: -x^2*(x+2)*(x^4-x^3-3*x^2+3*x+2) / ((x-1)^5*(x+1)^3). - Colin Barker, Aug 15 2014
Empirical: a(n) = n^3/3 +25*n^2/32 -23*n/24 -11/64 +n^4/32 +(-1)^n* (-n^2/32 -n/8 +11/64). - R. J. Mathar, Oct 01 2016
MATHEMATICA
f[k_] := Floor[(k + 3)/2]; t[n_] := Table[f[k], {k, 1, n}]
a[n_] := SymmetricPolynomial[2, t[n]]
Table[a[n], {n, 2, 50}] (* A203299 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Dec 31 2011
STATUS
approved