Number of nX2 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z.

A210782

Number of nX2 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) =15a(1) =176a(2) =1533a(3) =8824a(4) =40038a(5) =167910a(6) =710895a(7) =3139374a(8) =14621105a(9) =73775740a(10) =381369393a(11) =1896558198a(12) =8898865547a(13) =40479815828a(14) =186751218361a(15) =891575695494

External references