This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A222911 #5 Jul 23 2025 03:15:03 %S A222911 187,2522,119393,4320431,213112150,10615237672,577820456398, %T A222911 33236182725503,2041367121617874,132252751824700275 %N A222911 Number of 6Xn 0..3 arrays with no more than floor(6Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order. %C A222911 Row 6 of A222906 %e A222911 Some solutions for n=3 %e A222911 ..0..0..0....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0 %e A222911 ..0..0..0....0..0..0....0..1..1....0..0..1....0..0..0....0..0..0....0..0..0 %e A222911 ..0..0..0....0..0..0....2..0..1....1..1..1....0..0..0....0..0..0....0..0..1 %e A222911 ..0..0..0....0..0..0....0..0..0....1..1..1....0..1..2....1..2..0....1..1..1 %e A222911 ..1..1..0....1..0..1....0..0..0....2..1..0....1..1..3....0..1..1....1..2..2 %e A222911 ..2..1..3....1..1..1....0..0..0....0..2..2....3..0..1....0..1..1....1..3..3 %K A222911 nonn %O A222911 1,1 %A A222911 _R. H. Hardin_ Mar 09 2013