|
|
A147941
|
|
Number of permutations of floor(i*9/4), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
|
|
0
|
|
|
1, 2, 6, 16, 96, 376, 1924, 10496, 84546, 522100, 3532332, 28645680, 292372132, 2430262092, 21376627926, 227599952694
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|