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Template:Sequence of the Day for January 12

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Intended for: January 12, 2012

Timetable

  • First draft entered by Alonso del Arte on November 23, 2011
  • Draft to be reviewed by November 12, 2011
  • Draft to be approved by December 12, 2011

Yesterday's SOTD * Tomorrow's SOTD

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A006967: Number of graceful permutations of length
n
.
{ 1, 2, 4, 4, 8, 24, 32, 40, 120, ... }
There are exactly
n!
permutations. But of those, only a few are graceful for
n > 2
.