OFFSET
0,2
LINKS
F. v. Lamoen, Wave sequences
Index entries for linear recurrences with constant coefficients, signature (0,10,0,-15,0,7,0,-1).
FORMULA
G.f.: (-x^3-x^2+2*x+1) / (x^8-7*x^6+15*x^4-10*x^2+1). - Alois P. Heinz, Jul 16 2009
MAPLE
a:= n-> (Matrix([[ `if`(irem(n, 2)=0, 1, 2), 0, 0, 1]]). Matrix(4, (i, j)-> if i=j-1 then 1 elif j=1 then [10, -15, 7, -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
STATUS
approved