OFFSET
1,4
COMMENTS
Let a = RootOf( x^2+x+1 ) and b = 1+a. Same as number of degree-n irreducible polynomials over GF(4) with trace 0 and subtrace a. Same as number of degree-n irreducible polynomials over GF(4) with trace 0 and subtrace b.
Is this a duplicate of A074450? - R. J. Mathar, Dec 16 2020
LINKS
E. N. Kuz'min, Irreducible polynomials over a finite field and an analogue of Gauss sums over a field of characteristic 2, Siberian Mathematical Journal, 32, 982-989 (1991).
Jon Maiga, Computer-generated formulas for A074032, Sequence Machine.
FORMULA
a(n) = A042979(2*n)/2 [discovered by Sequence Machine]. - Andrey Zabolotskiy, Oct 09 2021
CROSSREFS
KEYWORD
nice,nonn
AUTHOR
Frank Ruskey and Nate Kube, Aug 26 2002
EXTENSIONS
More terms from Ruskey's website added by Joerg Arndt, Jan 16 2011
Terms a(17) and beyond from Andrey Zabolotskiy, Dec 15 2020
STATUS
approved