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A221653 Number of n X 3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns. 1

%I #6 Jul 03 2020 20:04:06

%S 2,24,230,2594,28478,313721,3449644,37942960,417316514,4589956344,

%T 50483589902,555254580431,6107085156536,67170072001106,

%U 738784285695336,8125675702282959,89371968083241970,982976551394628990

%N Number of n X 3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.

%C Column 3 of A221655.

%H R. H. Hardin, <a href="/A221653/b221653.txt">Table of n, a(n) for n = 1..40</a>

%e Some solutions for n=3

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

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

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

%Y Cf. A221655.

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 21 2013

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)