OFFSET
0,2
COMMENTS
Counts configuration of dimers on lattice strips.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Yong Kong, Monomer-dimer model in two-dimensional rectangular lattices with fixed dimer density, arXiv:cond-mat/0610690, 2006, v_c(n).
Index entries for linear recurrences with constant coefficients, signature (3,2,-3,-1).
MATHEMATICA
CoefficientList[Series[x (3 + x - x^3)/((1 - 3*x - x^2)*(1-x)*(1+x)), {x, 0, 40}], x] (* Vincenzo Librandi, Dec 23 2012 *)
LinearRecurrence[{3, 2, -3, -1}, {0, 3, 10, 36, 118}, 30] (* Harvey P. Dale, Sep 29 2023 *)
PROG
(Magma) I:=[0, 3, 10, 36, 118]; [n le 5 select I[n] else 3*Self(n-1)+2*Self(n-2)-3*Self(n-3)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Dec 23 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Jun 28 2012
EXTENSIONS
Offset changed from 1 to 0, added a(0)=0 by Vincenzo Librandi, Dec 23 2012
STATUS
approved