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A279970 Number of n X n 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 0

%I

%S 0,3,50,1922,124030,14787217,3444870482,1641425782980,

%T 1628526202127628,3404399281023205196,15152580196285407820510

%N Number of n X n 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

%C Diagonal of A279977.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A279977.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 24 2016

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Last modified September 25 22:02 EDT 2020. Contains 337344 sequences. (Running on oeis4.)