\documentclass[tikz]{standalone}

\usepackage{tikz}
\usepackage{luatextra}
\begin{document}

\begin{tikzpicture}
  \begin{luacode}
    lcsq = require('lcsq')
    seq2 = "ATCTGAT"
    seq1 = "TGCATA"
    matrix = lcsq.lcsq_matrix(seq1, seq2)
    tikz_code = lcsq.draw_lcsq_matrix_graph(seq1, seq2, matrix)
    tex.print(tikz_code)
    \end{luacode}
\end{tikzpicture}

\end{document}
