|
|
A360384
|
|
Number of permutations p of [n] satisfying |p(i+7) - p(i)| <> 7 for all 1 <= i <= n-7.
|
|
1
|
|
|
1, 1, 2, 6, 24, 120, 720, 5040, 38880, 323520, 2953728, 29666304, 326584320, 3919011840, 50969640960, 705722941440, 10504707686400, 167258901086208, 2836455721721856, 51038126752727040, 971132188892405760
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,hard,more
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|