2456655domain: NAppears in sequencesa(n) = a(n-1) + 2*a(n-3) with a(0)=a(1)=1, a(2)=3.at n=28A003229Expansion of 1/(1-x-2*x^3).at n=29A077949a(n) = A192809(n)/2.at n=11A192811Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 6 or 7 king-move adjacent elements, with upper left element zero.at n=27A305035