Number of nX1 1..7 arrays with every element value z a city block distance of exactly z from another element value z.

A209212

Number of nX1 1..7 arrays with every element value z a city block distance of exactly z from another element value z.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =3a(4) =3a(5) =16a(6) =24a(7) =114a(8) =202a(9) =763a(10) =1401a(11) =4515a(12) =9434a(13) =27254a(14) =63839a(15) =176658a(16) =434102a(17) =1150983a(18) =2879410a(19) =7477003a(20) =18723697a(21) =48021192a(22) =121277594a(23) =311110891a(24) =788523859a(25) =2015924491a(26) =5129396865a(27) =13105869640a(28) =33306947102a(29) =84824346802

External references