OFFSET
0,4
LINKS
I. G. Enting and A. J. Guttmann, Area-weighted moments of convex polygons on the square lattice, J. Phys. A 22 (1989), 2639-2642. See Eq. (4).
FORMULA
G.f.: x^2*((1 - 12*x + 50*x^2 - 76*x^3 + 42*x^4 - 48*x^5 + 32*x^6)/(1 - 4*x)^4 + 4*x^2/(1 - 4*x)^(5/2)).
MAPLE
t1:=x^2*( (1-12*x+50*x^2-76*x^3+42*x^4-48*x^5+32*x^6)/(1-4*x)^4 + 4*x^2/(1-4*x)^(5/2));
series(t1, x, 40);
seriestolist(%);
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 02 2015
STATUS
approved