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!)
A294825 Permutations of [n] avoiding {2431,1324,1342}. 0
1, 1, 2, 6, 21, 77, 285, 1054, 3889, 14330, 52800, 194748, 719602, 2664989, 9894443, 36831886, 137465657, 514370974, 1929432068, 7254441076, 27336758102, 103229845714, 390594944522, 1480679644876, 5622915464986, 21388666960212, 81486623660720, 310907347188280, 1187905972634884 (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 213.

MAPLE

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

((1 -5*x +8*x^2 -5*x^3)*C -1 +4*x -4*x^2 +x^3)/(x^2*(1 -2*x)) ;

taylor(%, x=0, 40) ;

gfun[seriestolist](%) ;

CROSSREFS

Sequence in context: A294822 A294823 A294824 * A101265 A101879 A242622

Adjacent sequences:  A294822 A294823 A294824 * A294826 A294827 A294828

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 February 19 16:24 EST 2020. Contains 332045 sequences. (Running on oeis4.)