login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178846 Number of permutations of 3..n+2 with no element divisible by an adjacent element. 0
1, 2, 6, 12, 72, 336, 1824, 13152, 134880, 649296, 8572800, 102194400, 1033046880, 12143232960, 210042192960, 2372176649280, 46447968686400, 648516678024960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

Sequence in context: A287142 A076220 A258213 * A173843 A107763 A166470

Adjacent sequences:  A178843 A178844 A178845 * A178847 A178848 A178849

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 17 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 27 05:37 EST 2021. Contains 341649 sequences. (Running on oeis4.)