# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a208395 Showing 1-1 of 1 %I A208395 #7 May 10 2023 07:52:13 %S A208395 14,1094,79092,5800644,424785708,31112194860,2278687944204, %T A208395 166893600277548,12223468411103052,895260103173464940, %U A208395 65569822288888377996,4802404999579303113900,351733358040572021645772 %N A208395 Number of 4 X n 0..2 arrays with new values 0..2 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 A208395 Row 4 of A208392. %H A208395 R. H. Hardin, Table of n, a(n) for n = 1..210 %F A208395 Empirical: a(n) = 61*a(n-1) +868*a(n-2) +2200*a(n-3) -7744*a(n-4) -17728*a(n-5) +40704*a(n-6) -13824*a(n-7) for n>9. %e A208395 Some solutions for n=4 %e A208395 ..0..1..0..2....0..1..2..1....0..0..1..2....0..0..0..0....0..1..2..1 %e A208395 ..1..1..1..2....2..2..1..2....2..1..0..0....1..1..0..2....2..2..0..0 %e A208395 ..1..2..2..1....0..2..2..2....1..1..1..0....2..0..1..0....0..2..2..0 %e A208395 ..1..1..0..1....0..0..2..1....2..1..2..2....1..2..0..2....0..1..0..1 %Y A208395 Cf. A208392. %K A208395 nonn %O A208395 1,1 %A A208395 _R. H. Hardin_, Feb 25 2012 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE