14382935710domain: NAppears in sequencesExpansion of x*(1 -15*x +99*x^2 -373*x^3 +879*x^4 -1338*x^5 +1311*x^6 -804*x^7 +289*x^8 -44*x^9) / [(1-3*x+x^2) *(1-2*x)^6 *(1-x)^2].at n=21A211387