OFFSET
0,3
COMMENTS
Second column in number triangle A113141.
LINKS
FORMULA
a(n) = -(-1)^n*(4n-2-C(1, n-1)+2*C(0, n)).
MATHEMATICA
CoefficientList[Series[(x(1-3x+x^2+x^3))/(1+x)^2, {x, 0, 100}], x] (* or *) LinearRecurrence[{-2, -1}, {0, 1, -5, 10, -14}, 100] (* Harvey P. Dale, Mar 23 2021 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Oct 15 2005
STATUS
approved