OFFSET
0,3
LINKS
Michael De Vlieger, Table of n, a(n) for n = 0..8475
Michael D. Hirschhorn, Non-trivial intertwined second-order recurrence relations, Fibonacci Quart. 43 (2005), no. 4, 316-325. See H_n.
Index entries for linear recurrences with constant coefficients, signature (-1,1,1,-1).
FORMULA
a(n) = -a(n-1) + a(n-2) + a(n-3) - a(n-4) for n > 3. - Taras Goy, Dec 24 2019
MATHEMATICA
CoefficientList[Series[1/(1 + x - x^2 - x^3 + x^4), {x, 0, 57}], x] (* Michael De Vlieger, Dec 24 2019 *)
LinearRecurrence[{-1, 1, 1, -1}, {1, -1, 2, -2}, 60] (* Harvey P. Dale, Jan 17 2021 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 10 2011
STATUS
approved