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例子
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a（1）=273解为{1,2,3}{4,5,6}{7,8,9}{10,11,12}{13,14,15}，具有3个不同的方向，以下18种模式中的每一种都具有15个方向：
{1,2,3} {4,5,15} {6,7,8} {9,10,11} {12,13,14}
{1,2,3} {4,14,15} {5,6,7} {8,9,10} {11,12 13}
{1,2,3} {4,5,6} {7,8,15} {9,10,11} {12 13,14}
{1,2,3} {4,5,15} {6,7,14} {8,9,10} {11,12,13}
{1,2,3} {4,14,15} {5,12,13} {6,7,8} {9,10,11}
{1,2,3} {4,5,15} {6,13,14} {7,8,9} {10,11,12}
{1,2,3} {4,14,15} {5,6,13} {7,8,9} {10,11,12}
{1,2,3} {4,5,15} {6,7,14} {8,9,13} {10,11,12}
{1,2,3} {4,5,15} {6,7,14} {8,12,13} {9,10,11}
{1,2,3} {4,5,15} {6,13,14} {7,8,12} {9,10,11}
{1,2,3} {4,14,15} {5,12,13} {6,7,11} {8,9,10}
{1,2,3} {4,15,8} {5,6,7} {9,10,11} {12,13,14}
{1,2,3} {4,15,8} {5,6,7} {9,13,14} {10,11,12}
{1,2,3} {4,15,8} {5,6,7} {9,10,14} {11,12,13}
{1,2,3} {4,5,15} {6,7,8} {9,10,14} {11,12,13}
{1,2,3} {4,14,15} {5,6,7} {8,12,13} {9,10,11}
{1,2,3} {4,14,15} {5,6,7} {8,9,13} {10,11,12}
{1,2,3} {4,5,15} {6,7,8} {9,13,14} {10,11,12}
在上面，数字可以被认为是15个集划分为5个块，或者是凸15个边的顶点划分为5三角形，顶点标记为1,2，。。。，顺序为15。
a（2）=1820，对应于将16边形的顶点划分为4个三角形和一个四边形的方法数。
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