[組合]排列組合
How many arrangements of the integer 1,2,...,n are there such that each
integer(except the first integer) differs by 1 from some integer to
the left of it in the arrangement?
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推
03/14 21:33, , 1F
03/14 21:33, 1F
→
03/14 22:11, , 2F
03/14 22:11, 2F
推
03/15 02:56, , 3F
03/15 02:56, 3F
→
03/15 02:57, , 4F
03/15 02:57, 4F
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