|
%I #4 Mar 31 2012 12:37:23
%S 15,3233,3012383,7289707650,35787552851324,309603034324088207
%N Number of 4Xn nonnegative integer arrays with new values 0 upwards 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 Row 4 of A208581
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..1..1..1..0....1..1..1..2....1..1..1..1....1..1..1..0....1..1..1..0
%e ..2..0..1..2....2..0..0..0....0..2..2..0....0..2..1..0....0..0..1..0
%e ..0..1..0..0....0..1..1..0....0..0..1..0....0..0..3..1....1..0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 29 2012
| 