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A004205

Number of permutations of length n with spread 1.

1, 3, 8, 25, 108, 735, 4608, 40824, 362000, 3628185, 40766976, 478988081, 6227101888, 87146087625, 1300561920000, 20922788404479, 355737629952000, 6402373698206889, 121810906419200000, 2432822933484213543, 51090942172652090368, 1124000727778962143055

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OFFSET

2,2

COMMENTS

The spread of a permutation p is Sum_{i=0..n-1} i*p(i), reduced modulo n. - Rintaro Matsuo, Dec 14 2022

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Rintaro Matsuo, Table of n, a(n) for n = 2..40

R. L. Graham and D. H. Lehmer, On the Permanent of Schur's Matrix, Jour. Australian Math. Soc. 21 no. 4 (series A) (1976), 487-497.

Rintaro Matsuo, Code used to calculate up to a(40)

CROSSREFS