A208632 - OEIS

%I #7 Dec 18 2015 18:18:03

%S 1,5,32,225,1652,12404,94320,722733,5565560,43005391,333132384,

%T 2585476348,20097106512,156418938680,1218807197408,9506457334965,

%U 74216779041840,579903491112365,4534776883051800,35488119754971345

%N Number of n X n 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors

%C Diagonal of A208637

%H R. H. Hardin, <a href="/A208632/b208632.txt">Table of n, a(n) for n = 1..27</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 29 2012