OFFSET
0,2
COMMENTS
With three leading zeros, is the inverse binomial transform of A077868, with three leading zeros. - Paul Barry, Oct 22 2004
LINKS
Index entries for linear recurrences with constant coefficients, signature (2, -1, -1).
FORMULA
a(n) = sum{k=0..n+3, C(n+3, k)(-1)^(n+3-k)*sum{j=0..floor((k-2)/2), C(k-2-2j, j+1)}}. - Paul Barry, Oct 22 2004
a(n) = sum{k=0..floor(n/3), C(n+1-k,n-3k)*(-1)^k}. - Tani Akinari, Oct 10 2014
MATHEMATICA
LinearRecurrence[{2, -1, -1}, {1, 2, 3}, 100] (* Vladimir Joseph Stephan Orlovsky, Jul 03 2011 *)
PROG
(PARI) Vec(1/(1-2*x+x^2+x^3)+O(x^99)) \\ Charles R Greathouse IV, Sep 26 2012
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved