OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.
Index entries for linear recurrences with constant coefficients, signature (8,-28,56,-70,56,-28,8,-1).
FORMULA
[ Sum_{i=1..min(8, n)} 2^8 * C(8, i) * C(n-1, i-1) ] + [ 2^(8-1)*C((((8+2n)/2)-1), 8-1) ].
G.f.: (x^8 + 8*x^7 + 28*x^6 + 56*x^5 + 198*x^4 + 56*x^3 + 28*x^2 + 8*x + 1) / (x-1)^8. - Colin Barker, Mar 04 2015
PROG
(PARI) Vec((x^8+8*x^7+28*x^6+56*x^5+198*x^4+56*x^3+28*x^2+8*x+1)/(x-1)^8 + O(x^100)) \\ Colin Barker, Mar 04 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
STATUS
approved