Function lfsr_generate_field 

pub fn lfsr_generate_field<F: FieldElem>(
    taps: &[F],
    seed: &[F],
    total: usize,
) -> Vec<F>

Replay a field LFSR: emit seed, then s[i] = -Σⱼ tapsⱼ·s[i-1-j] (the connection recurrence).