87838domain: NAppears in sequencesExpansion of (1 + 3*x)/(1 + 5*x + 9*x^2).at n=13A087169Expansion of x*(1+2*x)/(1+x+x^2-2*x^3).at n=27A103749Expansion of 1/(1-x*(1-3*x)).at n=26A106852Number of partitions of 12*n into parts < 5.at n=19A191593a(n) = -a(n-1) - 3*a(n-2) with n>1, a(0)=0, a(1)=1.at n=27A214733