VOOZH
about
URL: https://oeis.org/A179957
⇱ A179957 - OEIS
login
A179957
Number of permutations of 1..n such that |p(i)-p(i-1)|>= 4 for i>1.
5
1, 1, 0, 0, 0, 0, 0, 0, 2, 72, 1496, 25384, 399848, 6231544, 99133496, 1634227958, 28120703888, 506599465896, 9562489659952, 189055933191880, 3911226769004280, 84567966329357056
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
0,9
LINKS
Table of n, a(n) for n=0..21.
CROSSREFS
Sequence in context:
A283568
A070775
A157061
*
A221549
A289197
A174582
Adjacent sequences:
A179954
A179955
A179956
*
A179958
A179959
A179960
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Aug 03 2010
EXTENSIONS
a(0), a(19)-a(20) from
Alois P. Heinz
, Oct 27 2014
a(21) from
Alois P. Heinz
, Feb 10 2025
STATUS
approved
