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A147903 Number of permutations of floor(i*7/4), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique. 0
1, 2, 6, 24, 96, 456, 2134, 11650, 74546, 530962, 3437002, 24793292, 214741200, 2028628716, 17460401888, 162168439452 (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: A147898 A147890 A147912 * A147895 A070945 A152320

Adjacent sequences:  A147900 A147901 A147902 * A147904 A147905 A147906

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified November 27 04:53 EST 2021. Contains 349346 sequences. (Running on oeis4.)