OFFSET
0,3
COMMENTS
a(n) is the Wronskian of functions {cos(x), sin(x), cos(2x), sin(2x), ..., cos(n*x), sin(n*x)}.
LINKS
FORMULA
a(n) = (1! * 3! * ... * (2n-1)!)^2/n!.
EXAMPLE
a(3) = (1*6*120)^2/6 = 86400.
MAPLE
a:= n-> mul((2*i-1)!, i=1..n)^2/n!:
seq(a(n), n=0..8); # Alois P. Heinz, Aug 02 2023
MATHEMATICA
s = 1; Join[{s}, Table[s=s*((2*n-1)!)^2/n, {n, 2, 7}]] (* T. D. Noe, Oct 11 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Mark Sapir, Oct 11 2011
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Aug 02 2023
STATUS
approved