OFFSET
0,6
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,-2,2,0,-2,2,-2,1).
FORMULA
G.f.: x^4/((1-x)^3*(1+x)*(1+x^2)^2). - R. J. Mathar, Mar 11 2012
a(n) = floor(n/4)*floor((n+3)/4). - Bruno Berselli, Jun 08 2017
MATHEMATICA
f[n_]:=Module[{c=n/4}, Floor[c]Ceiling[c]]; f/@Range[0, 70] (* Harvey P. Dale, Apr 23 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved