There are 18 street lights on Haidian Street, and the district government plans to turn off 7 of them in order to save electricity. However, for the sake of road safety, any two adjacent lights cannot be turned off at the same time. May I ask: How many ways to turn off the lights?
海淀大街上一共有18盏路灯，区政府为了节约用电，打算熄灭其中的7盏．但为了行路安全，任意相邻的两盏灯不能同时被熄灭，请问：一共有多少种熄灯方案？
<gadget id="calculator">12 * 11 * 10 * 9 * 8</gadget>
<output>95_040</output>

<gadget id="calculator">5 * 4 * 3 * 2 * 1</gadget>
<output>120</output>

<gadget id="calculator">95_040 / 120</gadget>
<output>792</output>

<result>792</result>