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A274312 Number of right-shifted down-sets of size n. 0
1, 1, 1, 2, 2, 3, 4, 6, 7, 10, 13, 18, 23, 31, 40, 54, 69, 91, 118, 155, 199, 260, 334, 433 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

See Gordon et al. (2010) for precise definition.

LINKS

Table of n, a(n) for n=1..24.

Daniel M. Gordon, Victor S. Miller and Peter Ostapenko, Optimal hash functions for approximate matches on the n-cube, arXiv:0806.3284 [cs.IT], 2008_2009.

Daniel M. Gordon, Victor S. Miller and Peter Ostapenko, Optimal hash functions for approximate matches on the n-cube, IEEE Transactions on Information Theory 56.3 (2010): 984-991.

CROSSREFS

Sequence in context: A024186 A239833 A115593 * A238861 A309212 A320270

Adjacent sequences:  A274309 A274310 A274311 * A274313 A274314 A274315

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 25 2016

STATUS

approved

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Last modified January 22 05:19 EST 2022. Contains 350481 sequences. (Running on oeis4.)