OFFSET
1,3
LINKS
Gerzson Kéri, The factorization of compressed Chebyshev polynomials and other polynomials related to multiple-angle formulas, Annales Univ. Sci. Budapest (Hungary, 2022) Sect. Comp., Vol. 53, 93-108.
PROG
(PARI) a(n)={vecsum(factor(polchebyshev(n, 2, x)-1)[, 2])} \\ Andrew Howroyd, Jul 10 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 08 2003
EXTENSIONS
a(21)-a(85) from Andrew Howroyd, Jul 10 2018
STATUS
approved