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A180888
Number of permutations of 0..n-1 with no element greater than or equal to the sum of its neighbors
0
1, 0, 0, 0, 8, 24, 80, 504, 4600, 36176, 304888, 2842472, 29790752, 331382672, 3962130640, 50186636768, 680693513480
OFFSET
1,5
EXAMPLE
All solutions for n=5
(0 1 2 4 3) (0 1 3 4 2) (0 2 4 3 1) (0 3 4 2 1)
(1 2 4 3 0) (1 3 4 2 0) (2 4 3 1 0) (3 4 2 1 0)
CROSSREFS
Sequence in context: A241690 A141317 A146534 * A296400 A297808 A097544
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 23 2010
STATUS
approved