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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}}.
===1-factorization conjecture===
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