OFFSET
1,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,4,-4,-6,6,4,-4,-1,1).
FORMULA
From Chai Wah Wu, Feb 03 2021: (Start)
a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) - 6*a(n-4) + 6*a(n-5) + 4*a(n-6) - 4*a(n-7) - a(n-8) + a(n-9) for n > 9.
G.f.: x*(-9*x^6 - 16*x^5 - 135*x^4 - 64*x^3 - 135*x^2 - 16*x - 9)/((x - 1)^5*(x + 1)^4). (End)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved