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

A209367

Number of n X 1 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) =3a(1) =8a(2) =19a(3) =35a(4) =64a(5) =110a(6) =185a(7) =322a(8) =599a(9) =1084a(10) =1902a(11) =3280a(12) =5816a(13) =10425a(14) =18711a(15) =33023a(16) =58229a(17) =102865a(18) =183340a(19) =326023a(20) =578770a(21) =1023268a(22) =1814036a(23) =3218397a(24) =5719285a(25) =10142300a(26) =17984603a(27) =31872737a(28) =56560901a(29) =100345791

External references