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A147904 Number of permutations of floor(i*7/6), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique. 0
1, 2, 6, 16, 54, 232, 1194, 5348, 28874, 153508, 860486, 4887496, 36291722, 265127656, 2037271658, 15840444682 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

CROSSREFS

Sequence in context: A147891 A147922 A147913 * A147896 A147888 A147945

Adjacent sequences:  A147901 A147902 A147903 * A147905 A147906 A147907

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)