5785344domain: NAppears in sequencesNumber of defective 3-colorings of an n X 3 0..2 array connected horizontally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.at n=7A229581a(n) = Sum_{k=0..n} C(n,k) * (1 + 3^k)^(n-k) * 2^k.at n=6A244760