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A209361 Number of nX2 1..3 arrays with every element value z a city block distance of exactly z from another element value z 1

%I

%S 1,2,16,122,690,4098,24301,131984,720033,3945050,21470933,115976303,

%T 629975658,3432416744,18721854079,102389248936,560740694837,

%U 3070272326544,16802201754590,91916873329401,502611764211182

%N Number of nX2 1..3 arrays with every element value z a city block distance of exactly z from another element value z

%C Column 2 of A209365

%H R. H. Hardin, <a href="/A209361/b209361.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..2..3....1..3....2..3....3..3....1..2....1..3....2..2....2..3....3..2....3..3

%e ..2..2....1..2....3..2....2..2....1..1....1..3....1..1....2..2....3..3....3..3

%e ..3..2....2..2....3..2....3..2....3..2....3..3....2..2....3..2....2..2....3..3

%e ..1..1....2..3....2..2....3..2....1..1....1..1....1..1....2..1....3..3....1..3

%e ..1..2....2..2....3..2....2..2....1..3....3..3....1..2....1..1....2..2....1..3

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 06 2012

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Last modified September 19 12:38 EDT 2020. Contains 337178 sequences. (Running on oeis4.)