T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.

A221824

T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.

Terms

    a(0) =1a(1) =3a(2) =3a(3) =6a(4) =31a(5) =6a(6) =13a(7) =252a(8) =252a(9) =13a(10) =28a(11) =2113a(12) =6711a(13) =2113a(14) =28a(15) =60a(16) =17684a(17) =190756a(18) =190756a(19) =17684a(20) =60a(21) =129a(22) =147920a(23) =5374720a(24) =18636989a(25) =5374720a(26) =147920a(27) =129a(28) =277a(29) =1237439

External references