OFFSET
0,2
LINKS
F. v. Lamoen, Wave sequences
FORMULA
G.f.: (x^3+x^2-2*x-1) / (x^10-9*x^8+28*x^6-35*x^4+15*x^2-1). - Alois P. Heinz, Jul 16 2009
MAPLE
a:= n-> (Matrix([[`if`(irem(n, 2)=0, 1, 2), 0, 0, 0, -1]]). Matrix(5, (i, j)-> if i=j-1 then 1 elif j=1 then [15, -35, 28, -9, 1][i] else 0 fi) ^iquo(n, 2))[1, 1]: seq(a(n), n=0..30); # Alois P. Heinz, Jul 16 2009
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Alois P. Heinz, Jul 16 2009
STATUS
approved