0,4

F. Ruskey, Number of irreducible polynomials over GF(2) with given trace and subtrace

F. Ruskey, Number of elements of GF(2^n) of given trace and subtrace

C(n, r+0)+C(n, r+4)+C(n, r+8)+... where r = 3 if n odd, r = 1 if n even.

Cf. A038504, A000749.

Cf. A038518, A038519, A038520.

Sequence in context: A136242 A066732 A038520 this_sequence A081888 A019209 A019120

Adjacent sequences: A038518 A038519 A038520 this_sequence A038522 A038523 A038524

easy,nonn

Frank Ruskey (fruskey(AT)cs.uvic.ca)