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 A146124 #12 Mar 23 2018 12:28:38 %S A146124 0,32,516,2307,6472,14379,27684,48331,78552,120867,178084,253299, %T A146124 349896,471547,622212,806139,1027864,1292211,1604292,1969507,2393544, %U A146124 2882379,3442276,4079787 %N A146124 Number of n X n arrays of squares of integers summing to 5 with every element equal to at least one neighbor. %F A146124 Empirical (for n>=4): a(n) = 12*n^4 - 36*n^3 - 85*n^2 + 324*n - 188. - _Vaclav Kotesovec_, Nov 30 2012 %F A146124 Conjectures from _Colin Barker_, Mar 23 2018: (Start) %F A146124 G.f.: x^3*(32 + 356*x + 47*x^2 - 223*x^3 + 89*x^4 - 13*x^5) / (1 - x)^5. %F A146124 a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>8. %F A146124 (End) %K A146124 nonn %O A146124 2,2 %A A146124 _R. H. Hardin_, Apr 14 2009