121344domain: NAppears in sequencesSum of divisors of n-th term of Look and Say Sequence A005150.at n=4A079561Indices k where A057176(k) = 4.at n=27A086838a(n) = ((4+sqrt(5))*(1+sqrt(5))^n + (4-sqrt(5))*(1-sqrt(5))^n)/2.at n=9A163069Number of 1:3:sqrt(10) proportioned triangles on a (n+1) X (n+1) grid.at n=27A190102