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Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
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%I #6 May 03 2020 15:40:17

%S 0,4,109,4771,575754,173216147,127727388127,234129105357081,

%T 1063459512165657876

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

%C Diagonal of A297923.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A297923.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 08 2018