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A068604 Number of distinct coefficients in expansion related to enumeration of permutations of length n by length of longest subsequence. 1
1, 1, 2, 3, 6, 9, 16, 29, 51, 84, 138, 227, 370, 603, 980, 1589, 2576, 4172, 6756, 10936, 17700, 28646, 46357, 75013, 121381, 196405 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Hammersely has incorrect a(9)=55 in Table XIII on p. 387, due to four errors in Table XIV. In particular, the values 4168, 3772, 1475, and 2203 should be 3751, 3820, 1892, and 2255, respectively. Since these values occur elsewhere in the list, the number of distinct values is reduced to 51. - Sean A. Irvine, Feb 28 2024
REFERENCES
J. M. Hammersley, A few seedings of research, in Proc. Sixth Berkeley Sympos. Math. Stat. and Prob., ed. L. M. le Cam et al., Univ. Calif. Press, 1972, Vol. I, pp. 345-394.
LINKS
Sean A. Irvine, Java program (github)
CROSSREFS
Sequence in context: A017915 A114702 A026768 * A174023 A014868 A029463
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Mar 29 2002
EXTENSIONS
a(9) corrected and a(10)-a(26) from Sean A. Irvine, Feb 28 2024
STATUS
approved

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Last modified April 17 17:01 EDT 2024. Contains 371765 sequences. (Running on oeis4.)