

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
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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. 345394.


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CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



