此外,{1..2n}的2-均匀集分区的数目,使得没有块的两个顶点相差小于3。例如,a(4)=10集合分区为:
{{1,4}, {2,6}, {3,7}, {5,8}}
{{1,4}, {2,7}, {3,6}, {5,8}}
{{1,5}, {2,6}, {3,7}, {4,8}}
{{1,5}, {2,6}, {3,8}, {4,7}}
{{1,5}, {2,7}, {3,6}, {4,8}}
{{1,5}, {2,8}, {3,6}, {4,7}}
{{1,6}, {2,5}, {3,7}, {4,8}}
{{1,6}, {2,5}, {3,8}, {4,7}}
{{1,7}, {2,5}, {3,6}, {4,8}}
{{1,8}, {2,5}, {3,6}, {4,7}}
(结束)