A022163 First row of spectral array W(sqrt(3/2)).

1, 5, 6, 27, 33, 147, 180, 801, 981, 4365, 5346, 23787, 29133, 129627, 158760, 706401, 865161, 3849525, 4714686, 20977947, 25692633, 114319107, 140011740, 622980801, 762992541

Offset

0,2

Links

Table of n, a(n) for n=0..24.

A. Fraenkel and C. Kimberling, Generalized Wythoff arrays, shuffles and interspersions, Discrete Mathematics 126 (1994) 137-149.

Formula

Conjectures: a(n) = 6*a(n-2)-3*a(n-4). G.f.: -(3*x^3-5*x-1) / (3*x^4-6*x^2+1). - Colin Barker, Oct 23 2014

Prog

(PARI)
\\ The first row of the generalized Wythoff array W(h),
\\   where h is an irrational number between 1 and 2.
row1(h, m) = {
  my(
    a=vector(m, n, floor(n*h)),
    b=setminus(vector(m, n, n), a),
    w=[a[1]^2, b[a[1]]],
    j=3
  );
  while(1,
    if(j%2==1,
      if(w[j-1]<=#a, w=concat(w, a[w[j-1]]), return(w))
    ,
      if(w[j-2]<=#b, w=concat(w, b[w[j-2]]), return(w))
    );
    j++
  );
  w
}
row1(sqrt(3/2), 100000) \\ Colin Barker, Oct 23 2014

Crossrefs

Sequence in context: A121180 A022165 A342775 * A048060 A320665 A303731

Adjacent sequences: A022160 A022161 A022162 * A022164 A022165 A022166

Keyword

nonn,more

Author

Clark Kimberling

Extensions

a(14)-a(18) from Colin Barker, Oct 23 2014 and Michel Marcus, Oct 24 2014

a(19)-a(24) from Sean A. Irvine, May 13 2019

Status

approved