OFFSET
1,1
LINKS
Colin Barker, Table of n, a(n) for n = 1..160
Index entries for linear recurrences with constant coefficients, signature (1,0,0,11981655542024930675232002,-11981655542024930675232002,0,0,-1,1).
FORMULA
G.f.: -10*x*(211462*x^8 +198379896430716*x^7 +11072383489254815935515*x^6 +34322119735654912553073*x^5 -14213722750292211889419959*x^4 +20568424419816146874*x^3 +21924680085*x^2 +297*x +97) / ((x -1)*(x^2 -1860498*x +1)*(x^2 +1860498*x +1)*(x^4 +3461452808002*x^2 +1)).
EXAMPLE
970 is in the sequence because H(20) = 970 = 112 + 148 + 189 + 235 + 286 = H(7)+...+H(11).
PROG
(PARI) Vec(-10*x*(211462*x^8 +198379896430716*x^7 +11072383489254815935515*x^6 +34322119735654912553073*x^5 -14213722750292211889419959*x^4 +20568424419816146874*x^3 +21924680085*x^2 +297*x +97) / ((x -1)*(x^2 -1860498*x +1)*(x^2 +1860498*x +1)*(x^4 +3461452808002*x^2 +1)) + O(x^20)) \\ Colin Barker, May 15 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Colin Barker, May 15 2015
STATUS
approved