\begin{tabular}{@{}lrrrrrr@{}}
\toprule
$n$ & 2 & 3 & 4 & 5 & 6 & 7 \\
\midrule
$B(n)=n!\binom n2$ & 2 & 18 & 144 & 1200 & 10800 & 105840 \\
$N(n)$ (generic) & 2 & 18 & 132 & 980 & 7830 & 68502 \\
\bottomrule
\end{tabular}