// output of ./demo/seq/A213243-demo.cc:
// Description:
//% OEIS sequence A213243:
//% Number of nonzero elements in GF(2^n) that are cubes.
//% Also A213244: 5th powers.
//% Also A213245: 7th powers.
//% Also A213246: 9th powers.
//% Also A213247: 11th powers.
//% Also A213248: 13th powers.

arg 1: 6 == n  [degree of field (n>=1)]  default=6
arg 2: 3 == p  [exponent]  default=3
.1.1.1..1....111.11...1111..............1..1.......1..1..111..1.
ct=21