OFFSET
0,2
LINKS
FORMULA
G.f.: 1/((1 - x)*(1 - x + x^2)). - Philippe Deléham, Oct 11 2011
a(n) = a(n-1) - a(n-2) + 1. - Arkadiusz Wesolowski, Jun 08 2013
a(n) = -floor((n - 4)/6) - floor((n - 3)/6) + floor((n - 1)/6) + floor(n/6). - John M. Campbell, Dec 23 2016
E.g.f.: cosh(x) + 2*exp(x/2)*sin(sqrt(3)*x/2)/sqrt(3) + sinh(x). - Stefano Spezia, Feb 20 2023
MATHEMATICA
Table[-Floor[1/6 (-4 + n)] - Floor[1/6 (-3 + n)] + Floor[1/6 (-1 + n)] + Floor[n/6], {n, 0, 100}] (* John M. Campbell, Dec 23 2016 *)
LinearRecurrence[{2, -2, 1}, {1, 2, 2}, 100] (* Harvey P. Dale, Jul 17 2020 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Mark Dols, Sep 02 2009
EXTENSIONS
Offset corrected by John M. Campbell, Dec 23 2016
STATUS
approved