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 A146197 #7 Dec 18 2015 18:17:14 %S A146197 0,18,1070,8266,33102,97050,236458,508330,997046,1822042,3146450, %T A146197 5186698,8223070,12611226,18794682,27318250,38842438,54158810, %U A146197 74206306,100088522,133091950,174705178,226639050,290847786 %N A146197 Number of n X n arrays of squares of integers summing to 6 with every element equal to at least one neighbor. %F A146197 Empirical (for n>=5): a(n) = 4*n^6/3 - 4*n^5 + 14*n^4 - 178*n^3/3 - 886*n^2/3 + 3958*n/3 - 614. - _Vaclav Kotesovec_, Nov 30 2012 %K A146197 nonn %O A146197 2,2 %A A146197 _R. H. Hardin_ Apr 14 2009