OFFSET
0,3
COMMENTS
Tilings are counted irrespective of internal symmetry: Tilings that match each other after rotations and/or reflections are counted with their multiplicity.
LINKS
R. J. Mathar, Paving rectangular regions..., arXiv:1311.6135, Table 51.
R. J. Mathar, Tilings of Rectangular Regions by Rectangular Tiles: Counts Derived from Transfer Matrices, arXiv:1406.7788 [math.CO], eq. (34).
Index entries for linear recurrences with constant coefficients, signature (3,0,-1,1).
FORMULA
G.f.: (-1+x)^2/(x^3-x^4+1-3*x).
MAPLE
g := (-1+x)^2/(x^3-x^4+1-3*x) ;
taylor(%, x=0, 30) ;
gfun[seriestolist](%) ;
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
R. J. Mathar, Jan 29 2014
STATUS
approved