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A209390 Number of nX1 1..4 arrays with every element value z a city block distance of exactly z from another element value z 1

%I #6 Mar 31 2012 12:37:28

%S 0,1,1,3,3,13,16,42,74,161,303,631,1212,2446,4847,9714,19142,38031,

%T 75367,149813,296961,589537,1169118,2319453,4603741,9137804,18132445,

%U 35982420,71413411,141734249,281295511,558288679,1107995542,2198965721,4364220336

%N Number of nX1 1..4 arrays with every element value z a city block distance of exactly z from another element value z

%C Column 1 of A209394

%H R. H. Hardin, <a href="/A209390/b209390.txt">Table of n, a(n) for n = 1..210</a>

%e All solutions for n=7

%e ..3....4....2....3....3....3....1....1....3....1....4....1....2....1....2....2

%e ..4....2....2....4....3....1....1....1....1....1....1....1....2....1....2....4

%e ..2....4....2....2....3....1....1....2....1....1....1....1....2....4....2....2

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

%e ..2....4....1....2....3....1....1....2....1....1....4....2....2....1....2....2

%e ..4....2....1....4....3....1....1....2....1....1....1....2....2....1....1....4

%e ..3....4....1....2....3....3....1....2....1....3....1....2....2....4....1....3

%K nonn

%O 1,4

%A _R. H. Hardin_ Mar 07 2012

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)