OFFSET
2,1
LINKS
Colin Barker, Table of n, a(n) for n = 2..1000
J. P. McSorley, Counting structures in the Moebius ladder, Discrete Math., 184 (1998), 137-164.
Index entries for linear recurrences with constant coefficients, signature (15,-85,239,-391,405,-275,121,-32,4).
FORMULA
G.f.: see G in the Maple program. - Emeric Deutsch, Dec 21 2004
MAPLE
G := (28*x^8-220*x^7+841*x^6-1943*x^5+2882*x^4-2746*x^3+1609*x^2-503*x+60)*x^2/(x^2-2*x+1)/(-1+6*x-5*x^2+2*x^3)^2/(1-x): Gser:=series(G, x=0, 25): seq(coeff(Gser, x^n), n=2..23); # Emeric Deutsch, Dec 21 2004
PROG
(PARI) Vec(-x^2*(28*x^8 -220*x^7 +841*x^6 -1943*x^5 +2882*x^4 -2746*x^3 +1609*x^2 -503*x +60) / ((x -1)^3*(2*x^3 -5*x^2 +6*x -1)^2) + O(x^30)) \\ Colin Barker, Aug 01 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Emeric Deutsch, Dec 21 2004
STATUS
approved