OFFSET
0,2
COMMENTS
Binomial transform of A057960.
LINKS
FORMULA
a(0)=1, a(1)=3, a(2)=10, a(n)=6a(n-1)-9a(n-2)+2a(n-3), n>2.
a(n) = 2^n/3+(2+sqrt(3))(2+sqrt(3))^n/6+(2-sqrt(3))(2-sqrt(3))^n/6.
a(n) = A087944(n+1)/2.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Sep 16 2003
STATUS
approved