不规则三角形开始于:
三;
12;
9, 9;
12, 12;
39;
18, 18;
21, 21;
72;
27, 27;
30, 30;
96;
36, 36;
39, 15, 39;
120;
45, 45;
48, 48;
...
. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
. | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _|
. | |
. | |
. | | _ _ _ _ _ _ _ _ _ _ _ _ _ _
. _ _ _| | | _ _ _ _ _ _ _ _ _ _ _ _ _|
. | | | |
. _ _| _ _ _| | |
. 72 _| | | | _ _ _ _ _ _ _ _ _ _ _ _
. _| _| 21 _ _| | | _ _ _ _ _ _ _ _ _ _ _|
. | _| |_ _ _| | |
. _ _| _| _ _| | |
. | _ _| _| 18 _ _| | _ _ _ _ _ _ _ _ _ _
. | | | |_ _ _| | _ _ _ _ _ _ _ _ _|
. _ _ _ _ _| | 21 _ _| _| | |
. | _ _ _ _ _ _| | | _| _ _| |
. | | _ _ _ _ _| | 18 _ _| | | _ _ _ _ _ _ _ _
. | | | _ _ _ _ _| | | 39 _| _ _| | _ _ _ _ _ _ _|
. | | | | _ _ _ _| | _ _| _| | |
. | | | | | _ _ _ _| | _| 12 _| |
. | | | | | | _ _ _| | |_ _| _ _ _ _ _ _
. | | | | | | | _ _ _ _| 12 _ _| | _ _ _ _ _|
. | | | | | | | | _ _ _| | 9 _| |
. | | | | | | | | | _ _ _| 9 _|_ _|
. | | | | | | | | | | _ _| | _ _ _ _
. | | | | | | | | | | | _ _| 12 _| _ _ _|
. | | | | | | | | | | | | _| |
. | | | | | | | | | | | | | _ _|
. | | | | | | | | | | | | | | 3 _ _
. | | | | | | | | | | | | | | | _|
. |_| |_| |_| |_| |_| |_| |_| |_|
.
对于n=7,我们有4*7-2=26和第26行A237593型是[14,5,2,2,2,1,1,2,2,2,5,14],第25行A237593型是[13,5,3,1,2,1,1,2,1,3,5,13],因此在两条Dyck路径之间有两个区域(或部分)大小为[21,21],所以第7行是[21,21]。
26的除数之和是1+2+13+26=A000203号(26) = 42. 另一方面,西格玛(26)的对称表示的各部分之和为21+21=42,等于26的除数之和。