OFFSET
0,3
COMMENTS
Hankel transform of A141364.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,2,-2,0,-1,1)
FORMULA
G.f.: (1-5x^2-7x^3-2x^4+x^6)/(1-x-2x^3+2x^4+x^6-x^7)
a(0)=1, a(1)=1, a(2)=-4, a(3)=-9, a(4)=-11, a(5)=-21, a(6)=-31, a(n)=a(n-1)+ 2*a(n-3)- 2*a(n-4)-a(n-6)+a (n-7). - Harvey P. Dale, Oct 21 2013
MATHEMATICA
CoefficientList[Series[(1-5x^2-7x^3-2x^4+x^6)/((1-x)(1-x^3)^2), {x, 0, 60}], x] (* or *) LinearRecurrence[{1, 0, 2, -2, 0, -1, 1}, {1, 1, -4, -9, -11, -21, -31}, 60] (* Harvey P. Dale, Oct 21 2013 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Jun 27 2008
STATUS
approved