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Left factorials: Difference between revisions
Promote to full task from draft.
(→{{header|Perl 6}}: add 2nd algo that is O(N) rather than O(N^3) or so) |
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''Left factorials'', <math>!n</math>, may refer to either ''subfactorials'' or to ''factorial sums''; the same notation can be confusingly seen used for the two different definitions.
Sometimes, ''subfactorials'' (also known as ''derangements'') use the notations: <span style="font-family:serif">!''n''`</span> or <math>!n'</math> or <span style="font-family:serif">''n''¡</span>.
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