OFFSET
0,3
COMMENTS
a(n)=Sum(k*A128101(n,k), k=0..2*floor(n/2)).
REFERENCES
S. Heubach, Tiling an m X n area with squares of size up to k X k (m <=5), Congressus Numerantium 140 (1999), pp. 43-64.
LINKS
Index entries for linear recurrences with constant coefficients, signature (4,2,-16,-1,12,-4).
FORMULA
G.f.=z^2*(5-6z+3z^2)/(1-2z-3z^2+2z^3)^2.
MAPLE
g:=z^2*(5-6*z+3*z^2)/(1-2*z-3*z^2+2*z^3)^2: gser:=series(g, z=0, 32): seq(coeff(gser, z, n), n=0..29);
CROSSREFS
KEYWORD
nonn
AUTHOR
Emeric Deutsch, Feb 19 2007
STATUS
approved