OFFSET
0,6
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1,1,-4,6,-4,1).
FORMULA
From R. J. Mathar, Apr 15 2010: (Start)
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) + a(n-5) - 4*a(n-6) + 6*a(n-7) - 4*a(n-8) + a(n-9).
G.f.: x^4*(x^4 + 4*x^3 - 2*x^2 + 4*x + 1) / ( (1-x)^5*(x^4 + x^3 + x^2 + x + 1) ). (End)
MAPLE
A011925:=n->floor(n*(n-1)*(n-2)*(n-3)/15); seq(A011925(n), n=0..50); # Wesley Ivan Hurt, Jan 31 2014
MATHEMATICA
CoefficientList[Series[x^4*(x^4+4*x^3-2*x^2+4*x+1)/((1-x)^5*(x^4+x^3+x^2+x+1)), {x, 0, 50}], x] (* Vincenzo Librandi, Jun 19 2012 *)
PROG
(Magma) [Floor(n*(n-1)*(n-2)*(n-3)/15): n in [0..45]]; // Vincenzo Librandi, Jun 19 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved