严格分区y=（6,4,2,1）有半和{3,5,6,7,8,10}，其中不包括4，因此y在a（13）下计数。
a（6）=3到a（13）=15个严格分区：
(6) (7) (8) (9) (10) (11) (12) (13)
(4,2) (4,3) (5,3) (5,4) (6,4) (6,5) (7,5) (7,6)
(5,1) (5,2) (6,2) (6,3) (7,3) (7,4) (8,4) (8,5)
(6,1) (7,1) (7,2) (8,2) (8,3) (9,3) (9,4)
(4,3,1) (8,1) (9,1) (9,2) (10,2) (10,3)
(4,3,2) (5,3,2) (10,1) (11,1) (11,2)
(5,3,1) (5,4,1) (5,4,2) (5,4,3) (12,1)
(6,3,1) (6,3,2) (6,4,2) (6,4,3)
(6,4,1) (6,5,1) (6,5,2)
(7,3,1) (7,3,2) (7,4,2)
(7,4,1) (7,5,1)
(8,3,1) (8,3,2)
(5,4,2,1) (8,4,1)
(9,3,1)
(6,4,2,1)
