OFFSET
0,3
COMMENTS
Bisection of A107443.
LINKS
Index entries for linear recurrences with constant coefficients, signature (-2, -1, 4).
FORMULA
a(n) = (1/2)*(1 - A087168(n+1)).
PROG
(Magma) a087168:=func< n | &+[ Binomial(n+k, 2*k)*(-2)^(n-k): k in [0..n] ] >; [ (1-a087168(n+1))/2: n in [0..35] ];
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Ralf Stephan, Nov 29 2010
STATUS
approved