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%I #6 Apr 21 2020 12:59:54
%S 1,9,46,124,282,712,1738,4124,9562,21752,48730,107992,237082,516376,
%T 1117210
%N Number of n X n 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.
%C Diagonal of A280859.
%e Some solutions for n=4
%e ..0..1..1..2. .0..1..2..2. .0..1..1..0. .0..1..1..2. .0..1..2..0
%e ..0..2..0..0. .0..1..0..1. .0..2..0..2. .0..2..0..0. .2..1..2..1
%e ..1..2..1..2. .2..2..0..2. .1..2..1..2. .1..2..1..1. .2..0..0..1
%e ..1..0..0..2. .0..1..1..2. .1..0..0..1. .1..0..0..2. .1..1..2..2
%Y Cf. A280859.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 09 2017
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