Number of nX1 0..3 arrays with every element value z a city block distance of exactly z from another element value z.

A209173

Number of nX1 0..3 arrays with every element value z a city block distance of exactly z from another element value z.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =12a(4) =28a(5) =65a(6) =158a(7) =382a(8) =905a(9) =2145a(10) =5095a(11) =12138a(12) =28738a(13) =68088a(14) =161647a(15) =383228a(16) =908610a(17) =2154138a(18) =5108699a(19) =12115979a(20) =28729086a(21) =68134487a(22) =161588543a(23) =383218255a(24) =908831763a(25) =2155346429a(26) =5111614446a(27) =12122490597a(28) =28749145047a(29) =68180439683

External references