A240477 - OEIS

A240477

Number of n X n 0..1 arrays with no element equal to more than two horizontal or vertical neighbors, with new values 0..1 introduced in row major order

%I #5 Dec 18 2015 18:18:51

%S 1,8,122,4104,306749,50525365,18384693920,14778226489840,

%T 26250644316475949,103046989939554094945,893993929233158179056828

%N Number of n X n 0..1 arrays with no element equal to more than two horizontal or vertical neighbors, with new values 0..1 introduced in row major order

%C Diagonal of A240484

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 06 2014