31482domain: NAppears in sequencesSeries expansion for rectilinear polymers on square lattice.at n=10A007291Numbers k such that 3*5^(2*k) - 3*5^k + 1 is prime.at n=15A227447Number of length 2+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.at n=12A248463