OFFSET
1,1
EXAMPLE
See A186227.
MATHEMATICA
(* adjusted joint ranking; general formula *)
d=-1/2; u=1/2; v=1/2; w=0; x=5/2; y=-3/2; z=0;
h[n_]:=-y+(4x(u*n^2+v*n+w-z-d)+y^2)^(1/2);
a[n_]:=n+Floor[h[n]/(2x)];
k[n_]:=-v+(4u(x*n^2+y*n+z-w+d)+v^2)^(1/2);
b[n_]:=n+Floor[k[n]/(2u)];
Table[a[n], {n, 1, 100}] (* A186237 *)
Table[b[n], {n, 1, 100}] (* A186238 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Feb 16 2011
EXTENSIONS
Definition corrected by Georg Fischer, Sep 24 2021
STATUS
approved