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A221508 Number of 2Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction 1

%I #4 Jan 18 2013 17:50:21

%S 0,9,44,446,3334,27540,219070,1766136,14168766,113870162,914550470,

%T 7346946970,59015933032,474072774244,3808166264624,30590638905810,

%U 245731343642532,1973934759524284,15856413036814582,127372929035331130

%N Number of 2Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction

%C Row 2 of A221507

%H R. H. Hardin, <a href="/A221508/b221508.txt">Table of n, a(n) for n = 1..29</a>

%e Some solutions for n=3

%e ..0..3..0....0..4..0....1..2..0....0..2..2....1..0..0....0..2..0....0..1..0

%e ..1..1..1....1..0..1....1..2..0....0..2..0....0..4..1....1..2..1....0..3..2

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 18 2013

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Last modified April 15 17:19 EDT 2024. Contains 371693 sequences. (Running on oeis4.)