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 A194775 #6 Oct 27 2019 22:30:05 %S A194775 1740,4490,11857,31429,84727,229869,631373,1745459,4867831,13649561, %T A194775 38503606,109050858,310061698,883972100,2526165997,7230962925, %U A194775 20725462609,59454601239,170659921683,490024454069,1407237659011 %N A194775 Number of lower triangles of an (n+8) X (n+8) 0..5 array with new values introduced in row major order 0..5 and no element unequal to more than one horizontal or vertical neighbor. %C A194775 Column 5 of A194778. %e A194775 All solutions for 9 X 9 including a 5: %e A194775 0 0 0 0 %e A194775 1 1 1 1 1 1 1 1 %e A194775 1 1 2 1 1 1 1 1 1 1 1 1 %e A194775 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 %e A194775 1 1 2 2 3 2 2 2 2 3 2 2 2 2 2 2 2 2 2 2 %e A194775 1 1 2 2 3 3 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 %e A194775 1 1 2 2 3 3 4 2 2 2 2 3 3 4 3 3 3 3 3 3 3 3 3 3 3 3 3 4 %e A194775 1 1 2 2 3 3 4 4 2 2 2 2 3 3 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 4 4 %e A194775 1 1 2 2 3 3 4 4 5 2 2 2 2 3 3 4 4 5 4 4 4 4 4 4 4 4 5 3 3 3 3 3 3 4 4 5 %K A194775 nonn %O A194775 1,1 %A A194775 _R. H. Hardin_, Sep 02 2011