OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,6,-6,0,0,0,0,0,0,0,-1,1).
FORMULA
G.f.: x^2*(69*x^17 +15*x^16 +36*x^15 +21*x^14 +47*x^13 +21*x^12 +36*x^11 +15*x^10 +69*x^9 -327*x^8 -65*x^7 -144*x^6 -75*x^5 -141*x^4 -51*x^3 -72*x^2 -25*x -87)/((x-1)*(x^18 -6*x^9 +1)). - Colin Barker, Aug 05 2012
MATHEMATICA
LinearRecurrence[ {1, 0, 0, 0, 0, 0, 0, 0, 6, -6, 0, 0, 0, 0, 0, 0, 0, -1, 1}, {0, 87, 112, 184, 235, 376, 451, 595, 660, 987, 1440, 1575, 1971, 2256, 3055, 3484, 4312, 4687, 6580}, 120]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vladimir Joseph Stephan Orlovsky, Feb 09 2012
STATUS
approved