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A006246 Number of primitive sorting networks on n elements.
(Formerly M0920)
3
1, 1, 1, 2, 3, 20, 242, 6405, 316835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

REFERENCES

M. H. Klin et al., "2D-configurations and clique-cyclic orientations of the graphs L(K_p)", pages 149-162 of Reports in Molecular Theory, Vol. 1, 1990.

D. E. Knuth, ``Axioms and hulls,'' Lect. Notes Comp. Sci., Vol. 606.

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..9.

Index entries for sequences related to sorting

CROSSREFS

Cf. A006245.

Sequence in context: A012416 A261317 A177946 * A110372 A292866 A132421

Adjacent sequences:  A006243 A006244 A006245 * A006247 A006248 A006249

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 3 01:39 EDT 2020. Contains 333195 sequences. (Running on oeis4.)