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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

In Fishburn-Roberts (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, 103--137, 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, 103--137, 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, sub-Fibonacci sequences. Discrete Appl. Math. 44 (1993), no. 1-3, 261-281.

Sean A. Irvine, Complete set of sequences for a(11)

CROSSREFS

Sequences in the Fishburn-Roberts (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

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Last modified October 18 14:32 EDT 2019. Contains 328161 sequences. (Running on oeis4.)