OFFSET
0,6
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
Jean-Luc Baril, and Jean-Marcel Pallo, A Motzkin filter in the Tamari lattice, Discrete Mathematics 338.8 (2015): 1370-1378.
Index entries for linear recurrences with constant coefficients, signature (0,3,3,-3,-6,-2,3,3,1 ).
FORMULA
G.f.: x^3*(1+x+2*x^2+3*x^3+3*x^4+x^5)/(1-x^2-x^3)^3.
MATHEMATICA
CoefficientList[Series[x^3(1+x+2x^2+3x^3+3x^4+x^5)/(1-x^2-x^3)^3, {x, 0, 50}], x] (* or *) LinearRecurrence[{0, 3, 3, -3, -6, -2, 3, 3, 1}, {0, 0, 0, 1, 1, 5, 9, 18, 34}, 50] (* Harvey P. Dale, Feb 13 2022 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jun 04 2015
STATUS
approved