

A005268


Number of elementary sequences of length n.
(Formerly M1233)


6



1, 1, 2, 4, 10, 31, 120, 578, 3422, 24504, 208833, 2086777, 24123293, 318800755
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OFFSET

1,3


COMMENTS

In FishburnRoberts (1989) it is stated that no recurrence is known.  N. J. A. Sloane, Jan 04 2014


REFERENCES

Fishburn, Peter C.; Roberts, Fred S., Uniqueness in finite measurement. Applications of combinatorics and graph theory to the biological and social sciences, 103137, IMA Vol. Math. Appl., 17, Springer, New York, 1989. MR1009374 (90e:92099)
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..14.
Fishburn, Peter C.; Roberts, Fred S., Uniqueness in finite measurement, in Applications of combinatorics and graph theory to the biological and social sciences, 103137, IMA Vol. Math. Appl., 17, Springer, New York, 1989. MR1009374 (90e:92099). [Annotated scan of five pages only]
Peter C. Fishburn, Fred S. Roberts, Elementary sequences, subFibonacci sequences. Discrete Appl. Math. 44 (1993), no. 13, 261281.
Sean A. Irvine, Complete set of sequences for a(11)


CROSSREFS

Sequences in the FishburnRoberts (1989) article: A005269, A005268, A234595, A005272, A003513, A008926.
Sequence in context: A007177 A242347 A138415 * A243931 A005269 A070900
Adjacent sequences: A005265 A005266 A005267 * A005269 A005270 A005271


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane.


EXTENSIONS

a(11) corrected and a(12)a(14) from Sean A. Irvine, Apr 27 2016


STATUS

approved



