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 A266100 #4 Dec 21 2015 08:19:48 %S A266100 25,680,16103,371130,9880139,240721036,6206090116,154469020054, %T A266100 3932140956510,98694163378141,2499180663254917,62938133863924662, %U A266100 1590417698133685623,40104786316082042055,1012607062750588012145 %N A266100 Number of nX7 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself. %C A266100 Column 7 of A266101. %H A266100 R. H. Hardin, <a href="/A266100/b266100.txt">Table of n, a(n) for n = 1..210</a> %e A266100 Some solutions for n=3 %e A266100 ..0..1..2..3..2..1..0....1..0..0..1..1..0..1....0..0..2..1..0..2..1 %e A266100 ..2..1..2..1..2..0..0....1..1..1..1..0..2..0....0..1..1..1..1..0..0 %e A266100 ..0..0..0..0..0..0..1....1..0..2..1..1..0..0....1..0..1..1..0..0..1 %Y A266100 Cf. A266101. %K A266100 nonn %O A266100 1,1 %A A266100 _R. H. Hardin_, Dec 21 2015