A281073 - OEIS

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A281073

Number of n X n 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

%I #6 Apr 21 2020 13:00:42

%S 0,0,55,958,10954,89042,566178,3035844,14551996,65113158,280515214,

%T 1187820788,5004343732

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

%C Diagonal of A281080.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A281080.

%K nonn

%O 1,3

%A _R. H. Hardin_, Jan 14 2017