A294706 Number of permutations of [n] avoiding {4321, 3412, 1234}.

1, 1, 2, 6, 21, 69, 162, 240, 199, 73

Offset

0,3

Links

Table of n, a(n) for n=0..9.

D. Callan, T. Mansour, Enumeration of small Wilf classes avoiding 1324 and two other 4-letter patterns, arXiv:1705.00933 [math.CO] (2017), Table 2 No 1.

Maple

p := 73*x^9+199*x^8+240*x^7+162*x^6+69*x^5+21*x^4+6*x^3+2*x^2+x+1 ;
taylor(p, x=0, 40) ;
gfun[seriestolist](%) ;

Crossrefs

Sequence in context: A342440 A001434 A119098 * A294707 A116842 A294708

Adjacent sequences: A294703 A294704 A294705 * A294707 A294708 A294709

Keyword

nonn,easy,fini,full

Author

R. J. Mathar, Nov 07 2017

Status

approved