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A284159 Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. 2

%I #6 Apr 05 2020 21:32:48

%S 2,4,13,42,134,467,1689,6210,23178,87336,331172,1262635,4836199,

%T 18592719,71697865,277195002,1074041216,4169581090,16214541562,

%U 63150645344,246288102302,961707595682,3759467766802,14711266580343,57620439699189

%N Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

%C Column 2 of A284165.

%H R. H. Hardin, <a href="/A284159/b284159.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..0. .0..0. .0..1. .0..1. .0..0. .0..1. .0..1. .0..1. .0..1. .0..1

%e ..0..0. .0..1. .1..0. .1..0. .0..0. .1..0. .0..1. .0..1. .0..0. .1..1

%e ..0..1. .1..1. .0..1. .1..0. .1..1. .1..1. .0..0. .0..1. .1..1. .0..0

%e ..1..1. .1..1. .1..0. .0..1. .1..1. .0..0. .1..1. .1..0. .0..1. .0..1

%Y Cf. A284165.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 21 2017

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)