Number of nX1 1..3 arrays with every element value z a city block distance of exactly z from another element value z.

A209360

Number of nX1 1..3 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) =2a(5) =8a(6) =10a(7) =21a(8) =35a(9) =61a(10) =104a(11) =186a(12) =318a(13) =554a(14) =964a(15) =1679a(16) =2904a(17) =5049a(18) =8766a(19) =15231a(20) =26462a(21) =45992a(22) =79958a(23) =139000a(24) =241606a(25) =419980a(26) =729994a(27) =1268847a(28) =2205303a(29) =3832967

External references