Number of n X 1 0..2 arrays with every element value z a city block distance of exactly z from another element value z.

A209469

Number of n X 1 0..2 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) =10a(4) =21a(5) =46a(6) =97a(7) =207a(8) =437a(9) =920a(10) =1941a(11) =4090a(12) =8630a(13) =18217a(14) =38456a(15) =81197a(16) =171420a(17) =361878a(18) =763917a(19) =1612552a(20) =3403944a(21) =7185413a(22) =15167839a(23) =32018305a(24) =67588649a(25) =142675574a(26) =301179445a(27) =635771007a(28) =1342072303a(29) =2833028679

External references