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A005777 Rook polynomials.
(Formerly M3544)
+0
1
1, 4, 18, 96, 265, 672, 1617, 3776, 8577, 19080, 41745 (list; graph; listen)
OFFSET

1,2

REFERENCES

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

CROSSREFS

Adjacent sequences: A005774 A005775 A005776 this_sequence A005778 A005779 A005780

Sequence in context: A121584 A059227 A081103 this_sequence A001563 A094304 A094258

KEYWORD

nonn

AUTHOR

njas

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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