OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
Jean-Luc Baril, Sergey Kirgizov and Vincent Vajnovszki, Descent distribution on Catalan words avoiding a pattern of length at most three, arXiv:1803.06706 [math.CO], 2018.
Index entries for linear recurrences with constant coefficients, signature (1,3,9,-7,-6,1)
FORMULA
G.f.: -(3*x^5-9*x^3-2*x^2+1)/((x-1)*(x^5-5*x^4-12*x^3-3*x^2+1)).
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Aug 23 2022
STATUS
approved