OFFSET
1,1
FORMULA
a(n) = 4^n - 2^n - (-2)^n + (-1)^n. Proof: Resultant(p, q) = (Leading Coefficient of q)^(Degree of p) * Product(p(i):i roots of q). - Luke Pebody, Oct 12 2004
PROG
(PARI) a(n)={polresultant(x^n-1, polchebyshev(2, 2, x))} \\ Andrew Howroyd, Jul 10 2018
(PARI) a(n)={4^n - 2^n - (-2)^n + (-1)^n} \\ Andrew Howroyd, Jul 10 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 18 2003
EXTENSIONS
Terms a(11) and beyond from Andrew Howroyd, Jul 10 2018
STATUS
approved