T(n,k)=1/3 the number of nXk 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

A185559

T(n,k)=1/3 the number of nXk 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =3a(7) =26a(8) =26a(9) =3a(10) =5a(11) =120a(12) =224a(13) =120a(14) =5a(15) =11a(16) =576a(17) =2530a(18) =2530a(19) =576a(20) =11a(21) =21a(22) =2768a(23) =25496a(24) =58458a(25) =25496a(26) =2768a(27) =21a(28) =43a(29) =13256

External references