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 A340890 a(n) is the number of preference profiles for n men and n women, where all men prefer the same woman. 5

%I #30 Feb 02 2022 23:34:04

%S 1,8,5184,1719926784,990677827584000000,

%T 2495937495082991616000000000000,

%U 58001506007267709490243656115814400000000000000,23264754073069200132851692722771970253637181903994880000000000000000

%N a(n) is the number of preference profiles for n men and n women, where all men prefer the same woman.

%C This is the same number of preference profiles as when all men rank the same woman at the i-th place, where i can be anywhere from 1 to n.

%C Note that we can swap men and women in the definition of the sequence.

%C The total number of possible profiles is A185141.

%C a(n) = n!^n A342573(n), where A342573 ignores women's preferences.

%C a(n) is a subsequence of A001013.

%H Matvey Borodin, Eric Chen, Aidan Duncan, Tanya Khovanova, Boyan Litchev, Jiahe Liu, Veronika Moroz, Matthew Qian, Rohith Raghavan, Garima Rastogi, and Michael Voigt, <a href="https://arxiv.org/abs/2201.00645">Sequences of the Stable Matching Problem</a>, arXiv:2201.00645 [math.HO], 2021.

%F a(n) = n(n-1)!^n * n!^n.

%e When n=2, the total number of profiles is 16, and in half of them, the same woman is ranked 1st by both men.

%t Table[n (n - 1)!^n n!^n, {n, 10}]

%Y Cf. A001013, A185141, A342573.

%K nonn

%O 1,2

%A _Tanya Khovanova_ and MIT PRIMES STEP Senior group, Mar 31 2021

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Last modified June 12 10:07 EDT 2024. Contains 373329 sequences. (Running on oeis4.)