108955domain: NAppears in sequencesNumber of ternary strings of length n containing 00.at n=11A186244Expansion of (4 + 15*x - 35*x^2 + 20*x^3 - 2*x^5)/(1 - x)^5.at n=29A257600a(n) = (n^4 + 20*n^3 + 125*n^2 + 250*n + 24)/12.at n=29A257601