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A005778 Rook polynomials.
(Formerly M4647)
1
1, 9, 72, 320, 1185, 3892, 11776, 33480, 90745, 236808, 599112, 1477216, 3564001, 8439960, 19666688, 45183824, 102520881, 230046452, 511085960, 1125313056, 2457641857, 5327760940, 11471647872, 24547187800, 52225646057, 110524638672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

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

LINKS

Table of n, a(n) for n=1..26.

Earl Glen Whitehead, Jr., Four-discordant permutations, J. Austral. Math. Soc. Ser. A 28 (1979), no. 3, 369-377.

CROSSREFS

A diagonal of A259985.

Sequence in context: A069978 A070823 A073988 * A288351 A319892 A319873

Adjacent sequences:  A005775 A005776 A005777 * A005779 A005780 A005781

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Sean A. Irvine, Aug 27 2016

STATUS

approved

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Last modified February 21 19:40 EST 2019. Contains 320376 sequences. (Running on oeis4.)