OFFSET
0,3
FORMULA
a(0)=a(1)=0, a(2)=2; a(n) = floor( (a(n-1)+a(n-2)+a(n-3))/2 )
For n>9, a(n)=A180235(n-4)+1
a(n)/a(n-1) tends to 1.233751928528... which is a root of 2*x^3 - x^2 - x - 1 = 0
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Carl R. White, Aug 18 2010
STATUS
approved