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