OFFSET
1,1
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 30 2016: (Start)
a(n) = a(n-1) + a(n-5) - a(n-6).
G.f.: x*(x^5 + x^4 + x^3 + x^2 + 2*x + 2)/(x^6 - x^5 - x + 1). (End)
MATHEMATICA
LinearRecurrence[{1, 0, 0, 0, 1, -1}, {2, 4, 5, 6, 7, 10} , 50] (* G. C. Greubel, May 30 2016 *)
Select[Range[200], MemberQ[{2, 4, 5, 6, 7}, Mod[#, 8]] &] (* Vincenzo Librandi May 30 2016 *)
PROG
(Magma) [n: n in [0..150] | n mod 8 in [2, 4, 5, 6, 7]]; // Vincenzo Librandi, May 30 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved