OFFSET
0,1
COMMENTS
LINKS
Clark Kimberling, Table of n, a(n) for n = 0..2000
Index entries for linear recurrences with constant coefficients, signature (1, 0, 1, 1)
FORMULA
a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 2, a(1) = 2, a(2) = 2, a(3) = 1.
G.f.: (-2 + 3 x^3)/(-1 + x + x^3 + x^4).
MATHEMATICA
LinearRecurrence[{1, 0, 1, 1}, {2, 2, 2, 1}, 100]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Nov 29 2017
STATUS
approved