cp's OEIS Frontend

A208414 Number of 7Xn 0..3 arrays with new values 0..3 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 A208414 #7 Jul 22 2025 21:20:31
%S A208414 715,11188907,166729574522,2505261257850802,37620564383817645696,
%T A208414 564960990903273888822194,8484183047877022205116428184,
%U A208414 127409472349221599855304406138354,1913345483596257045380656751266037942
%N A208414 Number of 7Xn 0..3 arrays with new values 0..3 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 A208414 Row 7 of A208408
%H A208414 R. H. Hardin, <a href="/A208414/b208414.txt">Table of n, a(n) for n = 1..75</a>
%e A208414 Some solutions for n=4
%e A208414 ..0..0..1..2....0..1..1..2....0..1..0..0....0..0..0..1....0..0..0..0
%e A208414 ..1..1..3..2....0..1..0..0....1..0..1..2....0..1..0..1....1..0..2..2
%e A208414 ..0..3..3..0....0..0..3..0....1..1..0..0....0..2..2..1....0..2..3..1
%e A208414 ..1..3..2..1....1..1..2..0....3..1..3..0....1..2..2..0....1..0..1..1
%e A208414 ..1..2..1..1....2..2..1..0....1..0..1..3....1..3..1..3....2..2..1..0
%e A208414 ..0..2..0..3....3..2..2..0....2..3..1..3....1..0..3..3....0..3..0..0
%e A208414 ..0..0..2..1....2..3..3..0....2..2..1..1....3..2..1..3....1..1..1..3
%K A208414 nonn
%O A208414 1,1
%A A208414 _R. H. Hardin_ Feb 26 2012