Number of nX4 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.

A209370

Number of nX4 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.

Terms

    a(0) =35a(1) =129a(2) =242a(3) =968a(4) =3698a(5) =14112a(6) =54450a(7) =208658a(8) =798848a(9) =3065288a(10) =11761250a(11) =45106002a(12) =172980000a(13) =663426738a(14) =2544555122a(15) =9759442050a(16) =37430668832a(17) =143559037778a(18) =550601290962

External references