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 A202632 #7 Jul 22 2025 16:44:01 %S A202632 12,184,2428,32676,443100,5967248,80018540,1071819720,14345548208, %T A202632 191832756088,2563434424352,34237692810948,457102551851688, %U A202632 6100655850072092,81398668652158260,1085815517813680904 %N A202632 Number of nX2 0..3 arrays with adjacent row and column sums unequal. %C A202632 Column 2 of A202636 %H A202632 R. H. Hardin, <a href="/A202632/b202632.txt">Table of n, a(n) for n = 1..68</a> %e A202632 Some solutions for n=3 %e A202632 ..2..0....0..2....1..0....0..3....1..0....0..0....1..0....1..1....3..3....0..0 %e A202632 ..3..0....1..3....2..3....2..3....3..0....0..3....1..2....0..0....0..2....0..3 %e A202632 ..1..1....3..0....3..1....1..3....0..2....1..0....1..0....2..3....1..2....0..1 %K A202632 nonn %O A202632 1,1 %A A202632 _R. H. Hardin_ Dec 21 2011