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A013927 Begin with 2n cards in n piles of 2, the piles being {1,1},{2,2},{3,3},...,{n,n}. How many transpositions of adjacent (single) cards are needed to reverse the order of the piles? +0
1
0, 2, 5, 10, 15, 23 (list; graph; listen)
OFFSET

1,2
REFERENCES

Graham Brightwell, Michael Littman and Peter Winkler (pw(AT)research.bell-labs.com), unpublished.

CROSSREFS

Sequence in context: A125622 A080551 A008822 this_sequence A099738 A117582 A002134

Adjacent sequences: A013924 A013925 A013926 this_sequence A013928 A013929 A013930

KEYWORD

nonn

AUTHOR

njas

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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