a(3)=5!!*7^2 = (1*3*5) * 49 = 735.
a(2)=15 3-均匀超树:
{{1,2,3},{1,4,5}}
{{1,2,3},{2,4,5}}
{{1,2,3},{3,4,5}}
{{1,2,4},{1,3,5}}
{{1,2,4},{2,3,5}}
{{1,2,4},{3,4,5}}
{{1,2,5},{1,3,4}}
{{1,2,5},{2,3,4}}
{{1,2,5},{3,4,5}}
{{1,3,4},{2,3,5}}
{{1,3,4},{2,4,5}}
{{1,3,5},{2,3,4}}
{{1,3,5},{2,4,5}}
{{1,4,5},{2,3,4}}
{{1,4,5},{2,3,5}}
以下是跨越7个顶点的2个未标记的3-一致超树的非同构代表,以及它们在标记情况下的多重性,其总和为a(3)=735:
105 X{1,2,7}、{3,4,7}和{5,6,7}}
630 X{{1,2,6}、{3,4,7}、}5,6,7}}
(结束)