三角形开始
否。。1....2....3....4....5....6....7
= = = = = = = = = = = = = = = = = = = =
..1.|..1
..2.|..1....1
..3.|..1....4....1
..4.|。。1...10...10....1
..5.|..1...20...48...20....1
..6.|..1...35..161..161...35....1
..7.|..1...56..434..824..434...56....1
...
第三行:b^2+4*b*w+w^2。内部顶点着色为b(黑色)或w(白色);3个未着色的叶节显示为o。
.
重量b^2 w^2
b宽
/\ /\
/ \ / \
b o w o银行
/\ /\
/ \ / \
o o o o
.
重量b*w
黑白
/\ /\
/ \ / \
w o b o(不含b o)
/\ /\
/\/\
o o o o
.
黑白
/\ /\
/ \ / \
o和o b
/\ /\
/ \ / \
o o o o
|