cp's OEIS Frontend

A208471 Number of 6Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

%I A208471 #6 Jul 22 2025 21:23:21
%S A208471 203,4213597,675203938944,441285917587055633,838683310903953794594668,
%T A208471 3787532222733253394267947322830
%N A208471 Number of 6Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.
%C A208471 Row 6 of A208466
%e A208471 Some solutions for n=4
%e A208471 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e A208471 ..0..1..0..0....0..1..0..0....0..1..2..0....0..1..0..0....0..1..0..0
%e A208471 ..0..0..1..2....0..0..1..0....0..0..2..0....0..0..1..0....0..0..1..0
%e A208471 ..0..0..0..0....0..0..0..0....0..0..0..2....1..0..0..0....0..0..0..0
%e A208471 ..0..1..2..0....0..1..0..0....2..0..0..3....0..1..0..0....0..1..0..0
%e A208471 ..1..0..0..0....0..0..1..0....0..1..0..0....0..0..2..0....0..1..0..0
%K A208471 nonn
%O A208471 1,1
%A A208471 _R. H. Hardin_ Feb 27 2012