A006948 Number of zero-entropy permutations of length n. (Formerly M1255)

1, 2, 4, 12, 30, 90, 244, 776, 2218, 6946, 20468

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..11.

A. Blokh, E. Coven, and L. Block, Zero Entropy Permutations, International Journal of Bifurcation and Chaos 5 (1995), 1331-1337.

Crossrefs

Sequence in context: A366590 A308556 A148186 * A148187 A148188 A148189

Adjacent sequences: A006945 A006946 A006947 * A006949 A006950 A006951

Keyword

nonn,more

Author

Ethan Coven (ecoven(AT)wesleyan.edu)

Extensions

a(6) corrected and a(7)-a(11) from Sean A. Irvine, Sep 27 2017

Status

approved