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A147634 Number of permutations of 1..n with each sum of three adjacent terms unique. 0
1, 2, 6, 16, 54, 232, 936, 4136, 19112, 98666, 559598, 3448160, 22951024, 164020894, 1255124388, 10182613618, 87879918338 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Cf. A091217.

Sequence in context: A147726 A147916 A147907 * A147899 A147949 A147940

Adjacent sequences:  A147631 A147632 A147633 * A147635 A147636 A147637

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Nov 09 2008

EXTENSIONS

More terms from R. H. Hardin, Nov 11 2008

STATUS

approved

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Last modified January 21 05:13 EST 2022. Contains 350473 sequences. (Running on oeis4.)