Get a count of Gravity Forms entries in October 2018 that are not trashed that were not created by an Administrator

gf_entries_october_nonadmin.php

<?php
$admin_users    = get_users( [ 'role' => 'administrator' ] );
$admin_user_ids = wp_list_pluck( $admin_users, 'ID' );

$entries_search = [
	'status'        => 'active', // non-trashed entries
	'start_date'    => '2018-10-01 00:00:00', // October 1
	'end_date'      => '2018-10-31 23:59:59', // October 31
	'field_filters' => [
		[
			'key'      => 5, // Field ID 5
			'value'    => 277, // Entry value
			'operator' => '=',
		],
		// entry not created by an Administrator
		[
			'key'      => 'created_by',
			'value'    => $admin_user_ids,
			'operator' => 'NOT IN',
		],
	],
];

$used = GFAPI::count_entries( 3, $entries_search );