Denote the elements of the field $F_4$
by $\{0, 1, w, w + 1\}$
, where $w$
satisfies the following equation with coefficients in $F_2: w^2 + w + 1 = 0$
.
Vampire is a recurrent double sequence defined by $a(i, 0) = a(0, j) = 1$
and $a(i, j) = f(a(i, j-1), a(i-1, j-1), a(i-1, j))$
,
where $f(x, y, z) = w x + (w + 1) x^2 + (w + 1) y^2 + w z + (w + 1) z^2$
.
This recurrent double sequence can be also obtained using a system of substitutions of type 2 -> 4 with 15 rules, as it follows.