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A301785 Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero. 1

%I

%S 1,5,12,32,82,205,508,1258,3129,7837,19782,50310,128803,331592,857434,

%T 2224726,5787130,15082283,39360630,102820286,268777679,702935723,

%U 1839002254,4812250428,12594535285,32965703404,86292668280,225894991484

%N Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A301790.

%H R. H. Hardin, <a href="/A301785/b301785.txt">Table of n, a(n) for n = 1..36</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A301790.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 26 2018

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Last modified August 8 12:30 EDT 2022. Contains 356009 sequences. (Running on oeis4.)