A hash instead of an array could be useful for you:

use strict;
use warnings;

my %hash = (
    N1 => { A => 1, B => 1},
    N2 => { A => 1, B => 1},
    N3 => { A => 1, B => 1},
    N6 => { A => 1, B => 1},
    N7 => { A => 1, B => 1},
);

# usage e.g. 
print $hash{N3}{A}, "\n";
[download]