Dragonul
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Denote the elements of the field $F_{4}$ by $\{0, 1, w, w + 1\}$,
where $w$ satisfies the following equation with coefficients in $F_{2}: w^{2} + w + 1 = 0$.
Dragonul 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 $f(x, y, z ) = x^{2} + w x + (w + 1) y^{2} + w y + w z$.
This recurrent double sequence can be also obtained using a system of substitutions of type 2 -> 4 with 32 rules.
The system of substitutions is too large to be presented here.
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