%I #7 Apr 28 2023 07:14:32
%S 2,13,115,1468,19993,242036,2830612,33559479,405001256,4768478349,
%T 55177233176,632269120829,7270703713269,83723657505339,
%U 959510778223080,10972846708863116,125671067783934260,1441312273531923562
%N Number of n X 2 0..4 arrays with every element value z a city block distance of exactly z from another element value z.
%C Column 2 of A209720.
%H R. H. Hardin, <a href="/A209718/b209718.txt">Table of n, a(n) for n = 1..64</a>
%e Some solutions for n=5
%e ..3..3....0..1....3..3....1..2....2..4....0..0....0..4....2..0....4..1....3..0
%e ..1..3....3..1....3..3....1..2....0..2....3..2....0..3....2..3....0..1....4..4
%e ..1..3....0..2....1..3....2..2....3..3....2..2....3..1....2..2....1..1....0..3
%e ..1..3....2..3....1..3....0..2....4..2....1..3....4..1....3..1....1..1....3..0
%e ..3..3....0..2....0..3....1..1....3..3....1..2....0..3....2..1....4..0....4..4
%Y Cf. A209720.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 12 2012
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