OFFSET
0,7
FORMULA
a(n)=4*a(n-3)+11*a(n-6)-2*a(n-9). G.f.: x^2*(1-x)*(2*x^5-x^4+3*x^2+2*x+1)/ ((2*x^3+1)*(1-6*x^3+x^6)). [From R. J. Mathar, Aug 12 2009]
EXAMPLE
The last row of the matrix M^0 defined in the base sequences is 0,0,1, which starts the sequence with 0, 0, 1. The last row of M^1 is [1,1,1] which adds 1, 1, 1, that is a(3) to a(5), to the sequence.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Gary W. Adamson and Roger L. Bagula, Sep 17 2006
EXTENSIONS
Definition replaced by a more precise phrase by the Assoc. Editors of the OEIS, Mar 12 2010.
STATUS
approved