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A147726
Number of permutations of 1..n with all sums of 2 through 4 adjacent terms respectively unique.
0
1, 2, 6, 16, 54, 232, 936, 3880, 17302, 81584, 425550, 2332858, 13639774, 84416970, 555549406, 3834425860, 27937916790
OFFSET
1,2
CROSSREFS
Sequence in context: A147729 A147728 A147727 * A147916 A147907 A147634
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 11 2008
STATUS
approved