750242domain: NAppears in sequencesa(n+2) = 3*a(n+1) + a(n), with a(0) = 1, a(1) = 5.at n=11A108300Number of (n+1)X(3+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=12A232584