T(n,k)=Number of nXk 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z.

A210788

T(n,k)=Number of nXk 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z.

Terms

    a(0) =4a(1) =15a(2) =15a(3) =53a(4) =176a(5) =53a(6) =170a(7) =1533a(8) =1533a(9) =170a(10) =497a(11) =8824a(12) =21379a(13) =8824a(14) =497a(15) =1407a(16) =40038a(17) =142627a(18) =142627a(19) =40038a(20) =1407a(21) =3962a(22) =167910a(23) =748627a(24) =1115472a(25) =748627a(26) =167910a(27) =3962a(28) =10867a(29) =710895

External references