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%I A298127 #6 May 03 2020 15:43:36
%S A298127 0,1,4,15,2621,285084,76791444,58599163176,99650656591710,
%T A298127 437509891251025898
%N A298127 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
%C A298127 Diagonal of A298133.
%e A298127 Some solutions for n=5
%e A298127 ..0..0..1..1..1. .0..0..1..1..0. .0..0..0..1..1. .0..0..1..1..1
%e A298127 ..0..1..0..0..1. .1..0..1..0..0. .0..1..0..0..1. .0..0..1..0..1
%e A298127 ..1..0..0..1..0. .1..1..0..1..0. .1..0..1..1..1. .1..1..0..0..0
%e A298127 ..0..1..1..0..1. .1..0..0..1..0. .0..1..1..0..0. .1..0..1..1..0
%e A298127 ..0..0..1..1..1. .1..1..1..0..0. .0..0..1..0..0. .0..0..1..1..1
%Y A298127 Cf. A298133.
%K A298127 nonn
%O A298127 1,3
%A A298127 _R. H. Hardin_, Jan 13 2018

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