OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,3,0,-1).
FORMULA
a(n)= 2*a(n-1) + 3*a(n-2) - a(n-4), a(0)=1, a(n)=0 if n<0.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Dec 07 2011
STATUS
approved