154320122894domain: NAppears in sequencesExpansion of (1-x-x^2+2*x^3) / ((1-x)*(1+x)*(1-3*x+x^2)).at n=27A038990a(n) = F(n)^2 + F(n+1)^2 + F(n+2)^2, where F(n) denotes the n-th Fibonacci number.at n=26A127546