%I #6 Oct 01 2021 16:42:09
%S 52,90863,992352688,36182978136598,3233126493451564482
%N Number of 5 X n 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 5 of A208581.
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..0....0..1..0..0....0..0..0..0....0..0..0..0
%e ..1..1..1..0....1..2..1..0....0..1..1..0....1..1..1..0....1..1..1..0
%e ..2..0..1..0....0..0..1..0....0..0..1..0....0..0..1..0....0..0..1..2
%e ..0..1..0..1....1..2..0..1....1..2..0..1....1..0..1..0....1..0..0..0
%e ..0..1..0..0....0..1..2..0....0..1..0..0....0..1..0..1....0..1..1..0
%Y Cf. A208581.
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 29 2012