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A300343 Number of n X n 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0

%I

%S 0,2,9,58,306,1371,5451,20316,73826,268227,988143,3710046,14186486,

%T 55056941,215998713,853659146,3389857782,13500951049,53867577061

%N Number of n X n 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A300350.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300350.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 03 2018

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Last modified May 24 07:51 EDT 2022. Contains 354005 sequences. (Running on oeis4.)