There are 19 seats in a row in the auditorium. Xiao Ming and Xiao Qiang sit together, and Xiao Ming is on Xiao Qiang's right. How many different sitting methods are there in the same row?
礼堂里一排有19个座位，小明和小强坐在一起，并且小明在小强的右边，在同一排有多少中不同的坐法．
<gadget id="calculator">19 - 1</gadget>
<output>18</output>

<result>18</result>