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%I #6 Aug 20 2020 11:46:55
%S 1,3,6,13,46,254,2335,37679,1036686,47847128,3666918138,462476814296,
%T 95511722707577,32204769674856063,17694312704564808047,
%U 15825068959028242214319
%N Number of n X n 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.
%C Diagonal of A301662.
%e Some solutions for n=5
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
%e ..1..0..0..0..1. .1..0..1..1..1. .1..0..1..0..1. .0..1..0..1..0
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..1
%e ..1..0..1..0..1. .1..0..1..0..1. .1..0..1..0..1. .0..1..0..1..0
%e ..1..0..1..0..1. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1
%Y Cf. A301662.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 25 2018