OFFSET
1,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,1,-1).
FORMULA
From Chai Wah Wu, May 29 2016: (Start)
a(n) = a(n-1) + a(n-5) - a(n-6) for n>6.
G.f.: x*(x^5 + 3*x^4 + x^3 + x^2 + x + 1)/(x^6 - x^5 - x + 1). (End)
MATHEMATICA
LinearRecurrence[{1, 0, 0, 0, 1, -1}, {1, 2, 3, 4, 7, 9}, 50] (* G. C. Greubel, May 29 2016 *)
PROG
(Magma) [n : n in [0..100] | n mod 8 in [1, 2, 3, 4, 7]]; // Wesley Ivan Hurt, May 29 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved