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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

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

Adjacent sequences:  A180885 A180886 A180887 * A180889 A180890 A180891

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 23 2010

STATUS

approved

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Last modified September 21 07:08 EDT 2019. Contains 327253 sequences. (Running on oeis4.)