95968domain: NAppears in sequencesNumber of 4-step knight's tours on an (n+2) X (n+2) board summed over all starting positions.at n=16A186853a(n) = 5*a(n-1) - 6*a(n-2) + a(n-3) with a(0)=1, a(1)=2, a(2)=7.at n=10A215694n/2 analog of Keith numbers.at n=9A282766