OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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 73.
FORMULA
a(n) = 10*a(n-1) - 45*a(n-2) + 120*a(n-3) - 210*a(n-4) + 252*a(n-5) - 210*a(n-6) + 120*a(n-7) - 45*a(n-8) + 10*a(n-9) - a(n-10) for n > 10. - Chai Wah Wu, Oct 22 2018
MAPLE
-(x^10-15*x^8+55*x^7-111*x^6+149*x^5-141*x^4+89*x^3-37*x^2+9*x-1)/(x-1)^10 ;
taylor(%, x=0, 40) ;
gfun[seriestolist](%) ;
MATHEMATICA
CoefficientList[Series[-(x^10 - 15 x^8 + 55 x^7 - 111 x^6 + 149 x^5 - 141 x^4 + 89 x^3 - 37 x^2 + 9 x - 1) / (x - 1)^10, {x, 0, 40}], x] (* Vincenzo Librandi, Oct 23 2018 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Nov 08 2017
STATUS
approved