Hadamard matrices and $\delta$-codes of length $3n$

It is found that four-symbol $\delta$-codes of length $t = 3n$ can be composed for odd $n \leqslant 59$ or $n = {2^a}{10^b}{26^c} + 1$, where all $a$, $b$ and $c \geqslant 0$. Consequently new families of Hadamard matrices of orders $4tw$ and $20tw$ can be constructed, where $w$ is the order of Williamson matrices.