OFFSET
0,3
FORMULA
a(n)= (-1)^n*A091003(n), n>0.
a(n+1)-3*a(n) = (-1)^(n+1)*A000079(n-1), n>0.
|a(n+1)-3*a(n)| = A011782(n).
O.g.f.: (1+3x)x/((1+2x)(1-3x)). a(n)=((-2)^n+4*3^n)/10, n>0. - R. J. Mathar, Jul 14 2008
a(n) = a(n-1)+6*a(n-2) for n>2, a(0)=0, a(1)=1, a(2)=4. - Philippe Deléham, Nov 17 2013
a(n) + a(n+1) = A140796(n). - Philippe Deléham, Nov 17 2013
a(n+1) = sum_{k=0..n} A108561(n,k)*(-3)^k. - Philippe Deléham, Nov 17 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Curtz, Jul 12 2008
EXTENSIONS
Edited and extended by R. J. Mathar, Jul 14 2008
STATUS
approved