

A002004


DavenportSchinzel numbers of degree 4 on n symbols.
(Formerly M3328 N1339)


5



1, 4, 8, 12, 17, 22, 27, 32, 37, 42, 47, 53, 58, 64, 69, 75, 81, 86, 92, 98, 104
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OFFSET

1,2


REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, E20.
D. P. Roselle and R. G. Stanton, Results on DavenportSchinzel sequences, pp. 249267 in Proceedings of the Louisiana Conference on Combinatorics, Graph Theory and Computer Science. Vol. 1, edited R. C. Mullin et al., 1970.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. G. Stanton and P. H. Dirksen, DavenportSchinzel sequences, Ars. Combin., 1 (1976), 4351.


LINKS

Table of n, a(n) for n=1..21.
R. G. Stanton and P. H. Dirksen, DavenportSchinzel sequences, Ars. Combin., 1 (1976), 4351. [Annotated scanned copy]
R. G. Stanton and P. H. Dirksen, DavenportSchinzel sequences, Ars. Combin., 1 (1976), 4351. [Annotated scanned copy, different annotations from one above]
Eric Weisstein's World of Mathematics, DavenportSchinzel Sequence.


CROSSREFS

A column of array in A259874.
Sequence in context: A311534 A311535 A311536 * A311537 A311538 A033156
Adjacent sequences: A002001 A002002 A002003 * A002005 A002006 A002007


KEYWORD

nonn,nice,more


AUTHOR

N. J. A. Sloane.


EXTENSIONS

Title improved by Sean A. Irvine, Feb 19 2016


STATUS

approved



