643475domain: NAppears in sequencesNumber of (n+2) X 4 0..2 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..2 introduced in row major order.at n=10A204364Numerator of answer to sock-sorting problem with n socks.at n=6A225177