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A294818
Number of permutations of [n] avoiding {1324, 2314, 2431}.
0
1, 1, 2, 6, 21, 76, 271, 938, 3146, 10252, 32583, 101368, 309697, 931708, 2766374, 8121630, 23612985, 68076148, 194824915, 553979438, 1566301826, 4406286736, 12340335627, 34422720496, 95676632581, 265071811456, 732238423646, 2017390937058, 5544712079421, 15205817438572
OFFSET
0,3
LINKS
MAPLE
(1 -9*x +31*x^2 -49*x^3 +34*x^4 -7*x^5)/((1 -3*x +x^2)^2*(1 -2*x)^2) ;
taylor(%, x=0, 40) ;
gfun[seriestolist](%) ;
CROSSREFS
Sequence in context: A116769 A294817 A294772 * A116809 A116819 A294819
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Nov 09 2017
STATUS
approved