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Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.
0

%I #6 Aug 20 2020 11:45:38

%S 1,3,9,79,658,10783,255406,9891331,588765472,55421789236,8214384910527

%N Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

%C Diagonal of A301541.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A301541.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 23 2018