7241782987domain: NAppears in sequencesExpansion of 1/(1 - 2*x - 2*x^2 - 3*x^3).at n=21A077834Number of (n+2) X (1+2) 0..2 arrays with each row and column divisible by 13, read as a base-3 number with top and left being the most significant digits.at n=20A263334