289370domain: NAppears in sequencesNumber of (1+1)X(n+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or antidiagonally, with no adjacent elements equal.at n=19A232590Expansion of 1/(1 - 4*x/(1-x)^2)^(5/2).at n=6A382274