Number of nX1 1..5 arrays with every element value z a city block distance of exactly z from another element value z.

A209020

Number of nX1 1..5 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) =21a(7) =71a(8) =114a(9) =305a(10) =581a(11) =1437a(12) =2980a(13) =6856a(14) =14671a(15) =32681a(16) =70376a(17) =156129a(18) =340985a(19) =753249a(20) =1642055a(21) =3601624a(22) =7879835a(23) =17280310a(24) =37865836a(25) =83031844a(26) =181895623a(27) =398628603a(28) =873357406a(29) =1913797135

External references