OFFSET
0,2
LINKS
A. F. Y. Zhao, Pattern Popularity in Multiply Restricted Permutations, Journal of Integer Sequences, 17 (2014), #14.10.3.
Index entries for linear recurrences with constant coefficients, signature (10,-41,88,-104,64,-16).
FORMULA
G.f.: 1/(((1-x)^2)*(1-2*x)^4).
a(n) = A055584(n+5, 5).
a(n) = Sum_{j=0..n-1} a(j) + A055582(n) for n >= 1.
E.g.f.: exp(x)*(x + 9) + 8*exp(2*x)*(2*x^3 + 3*x^2 + 6*x - 3)/3. - Stefano Spezia, Sep 24 2024
PROG
(PARI) Vec(1/(((1-x)^2)*(1-2*x)^4) + O(x^40)) \\ Michel Marcus, Dec 11 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Wolfdieter Lang, May 26 2000
STATUS
approved