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!)
A294823 Permutations of [n] avoiding {1234,1324,2341}. 0
1, 1, 2, 6, 21, 77, 284, 1041, 3789, 13730, 49679, 179906, 653083, 2378702, 8696754, 31921462, 117624497, 435047541, 1614769933, 6013417811, 22463101851, 84151166305, 316084324517, 1190187380109, 4491810419947, 16988382790291, 64379012014331, 244422429188511, 929587527276463 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..28.

D. Callan, T. Mansour, Enumeration of small Wilf classes avoiding 1324 and two other 4-letter patterns, arXiv:1705.00933 [math.CO] (2017), Table 1 No 211.

MAPLE

C := (1-sqrt(1-4*x))/2/x ;

((1 -4*x +5*x^2 -3*x^3)*C -(1 -4*x +6*x^2 -4*x^3))/(x*(1 -x)^2*(1 -2*x)) ;

taylor(%, x=0, 40) ;

gfun[seriestolist](%) ;

CROSSREFS

Sequence in context: A144904 A151287 A294822 * A294824 A294825 A101265

Adjacent sequences:  A294820 A294821 A294822 * A294824 A294825 A294826

KEYWORD

nonn,easy

AUTHOR

R. J. Mathar, Nov 09 2017

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 May 28 03:04 EDT 2020. Contains 334671 sequences. (Running on oeis4.)