T（3,1）=4：
._____. ._____.
|___. | | ._|
|_. | | |___| |
| | |_| | .___|
| |___| |_| |
|_____| (*2) |_____| (*2) .
三角形T（n，k）开始于：
00 : 1;
01 : 1;
02 : 5;
03 : 52, 4;
04 : 451, 48, 2;
05 : 3498, 484, 24;
06 : 23502, 4136, 300, 12;
07 : 173611, 37674, 3262, 142;
08 : 1323447, 335388, 35938, 1964, 44;
09 : 9920654, 2892492, 365458, 25752, 986, 12;
10 : 73573634, 24266128, 3544842, 298200, 15002, 400, 6;
