OFFSET
0,8
COMMENTS
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
FORMULA
Empirical g.f.: -x^4*(x^2-x+1) / ((x-1)^3*(x+1)*(x^2+1)^2). - Colin Barker, Mar 31 2013
PROG
(Haskell)
a008217 n = a008217_list !! n
a008217_list = zipWith (*) (tail qs) qs where qs = map (`div` 4) [0..]
-- Reinhard Zumkeller, Oct 09 2011
(PARI) a(n) = floor(n/4)*floor((n+1)/4); /* Joerg Arndt, Mar 31 2013 */
(Python)
def A008217(n): return (n>>2)*(n+1>>2) # Chai Wah Wu, Feb 02 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved