T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor.

A221001

T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor.

Terms

    a(0) =1a(1) =3a(2) =3a(3) =8a(4) =31a(5) =8a(6) =21a(7) =306a(8) =306a(9) =21a(10) =55a(11) =2989a(12) =11017a(13) =2989a(14) =55a(15) =144a(16) =29135a(17) =394580a(18) =394580a(19) =29135a(20) =144a(21) =377a(22) =283872a(23) =14113081a(24) =51672851a(25) =14113081a(26) =283872a(27) =377a(28) =987a(29) =2765627

External references