a(6)=8,因为一个3 X 6矩形有8个平铺,使用直(3 X 1)三角线和2 X 2平铺:
._._._._._._. ._____._._._. ._._____._._. ._._._____._.
| | | | | | | |_____| | | | | |_____| | | | | |_____| |
| | | | | | | |_____| | | | | |_____| | | | | |_____| |
|_|_|_|_|_|_| |_____|_|_|_| |_|_____|_|_| |_|_|_____|_|
._._._._____. ._____._____. .___.___.___. ._____._____.
| | | |_____| |_____|_____| | | | | |_____|_____|
| | | |_____| |_____|_____| |___|_._|___| | | | |
|_|_|_|_____| |_____|_____| |_____|_____| |___|___|___|