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Undid revision 971246833 by 184.161.107.105 (talk) "is 2-factorable" means "can be partitioned into two perfect matchings", and does not mean "has a 2-factor" |
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The number of distinct 1-factorizations of ''K''<sub>2</sub>, ''K''<sub>4</sub>, ''K''<sub>6</sub>, ''K''<sub>8</sub>, ... is 1, 1, 6, 6240, 1225566720, 252282619805368320, 98758655816833727741338583040, ... {{oeis|A000438}}.
(Reader comment: The number of distinct 1-factorizations of ''K''<sub>4</sub> is 3, and is easy to check by hand. Why is this incorrect in the OEIS database?)
===1-factorization conjecture===
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