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A294766 revision #2

A294766

Permutations of [n] avoiding {4312, 1432, 1234}.

1, 1, 2, 6, 21, 74, 248, 784, 2355, 6785, 18897, 51177, 135358, 350788, 893038, 2237998, 5530485, 13496371, 32566359, 77785039, 184083080, 432004206, 1006097772, 2326777196, 5346673751, 12213795349, 27749494413, 62729986469, 141146690370, 316216935240, 705582559642, 1568468327962, 3474360060073, 7670811537703, 16883516381043, 37052682795883, 81093277441260, 177021371988946, 385481904658424

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..38.

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 119

MAPLE

(-350*x^4-63*x^2+419*x^5-26*x^8+138*x^7-317*x^6+188*x^3+x^9-1+12*x)/((2*x-1)^4*(x-1)^5) ;

taylor(%, x=0, 40) ;

gfun[seriestolist](%) ;

CROSSREFS

Sequence in context: A116831 A294698 * A116752 A294767 A116827 A116780

Adjacent sequences: A294763 A294764 A294765 * A294767 A294768 A294769

KEYWORD

nonn,easy

AUTHOR

R. J. Mathar, Nov 08 2017

STATUS

editing