//カテゴリーの除外
$exclude_category_ids = get_archive_exclude_category_ids();
// 除外するカテゴリーを配列で指定する
$ayatoito_exclude_category_ids = [13];

if (! $exclude_category_ids) {
  $args += array(
    'category__not_in' => $ayatoito_exclude_category_ids,
  );
} elseif (!$categories && $exclude_category_ids && is_array($exclude_category_ids)) {
  $exclude_category_ids = array_merge($exclude_category_ids, $ayatoito_exclude_category_ids);
  $args += array(
    'category__not_in' => $exclude_category_ids,
  );
}