|
| |
|
|
A177313
|
|
Number of permutations of 9 copies of 1..n with all adjacent differences <= 1 in absolute value.
|
|
2
|
|
|
|
1, 1, 48620, 60110030, 161686253810, 304100156874800, 574996024253854586, 1016915629343040544250, 1745708356607370063330620, 2911820015993491302722966990, 4754502826758413615581742528138, 7626389809822483147908697112197520, 12055478550658617275428327115583119762
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
COMMENTS
|
a(n) = (9n)!/362880^n = A172613(n) for n<=2.
|
|
|
LINKS
|
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
EXTENSIONS
|
|
|
|
STATUS
|
approved
|
| |
|
|
