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示例
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a(1)=1到a(9)=12组分:
(1) (2) (3) (4) (5) (6) (7) (8) (9)
(1,2) (1,3) (1,4) (1,5) (1,6) (1,7) (1,8)
(2,1) (3,1) (2,3) (5,1) (2,5) (3,5) (2,7)
(3,2) (1,2,3) (3,4) (5,3) (4,5)
(4,1)(1,3,2)(4,3)(7,1)(5,4)
(2,1,3) (5,2) (1,2,5) (7,2)
(2,3,1) (6,1) (1,3,4) (8,1)
(3,1,2) (1,4,3) (1,3,5)
(3,2,1) (1,5,2) (1,5,3)
(2,1,5)(3,1,5)
(2,5,1) (3,5,1)
(3,1,4) (5,1,3)
(3,4,1) (5,3,1)
(4,1,3)
(4,3,1)
(5,1,2)
(5,2,1)
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