OFFSET
2,3
LINKS
Colin Barker, Table of n, a(n) for n = 2..1000
Index entries for linear recurrences with constant coefficients, signature (1,4,-3,-7,2,8,2,-7,-3,4,1,-1).
FORMULA
G.f.: x^2 / ((1 - x)^6*(1 + x)^4*(1 + x + x^2)).
a(n) = a(n-1) + 4*a(n-2) - 3*a(n-3) - 7*a(n-4) + 2*a(n-5) + 8*a(n-6) + 2*a(n-7) - 7*a(n-8) - 3*a(n-9) + 4*a(n-10) + a(n-11) - a(n-12) for n>11. - Colin Barker, May 10 2019
MATHEMATICA
Drop[CoefficientList[Series[x^2/((1-x)(1-x^2)^4(1-x^3)), {x, 0, 50}], x], 2] (* Harvey P. Dale, Aug 24 2011 *)
PROG
(PARI) Vec(x^2 / ((1 - x)^6*(1 + x)^4*(1 + x + x^2)) + O(x^50)) \\ Colin Barker, May 10 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Mike Zabrocki, Jan 21 2006
STATUS
approved